# List of members of the National Assembly (South Korea), 2016–2020

The 20th session of the National Assembly of South Korea first convened on 30 May 2016 and was seated until 29 May 2020. Its members were first elected in the 2016 legislative election held on 13 April 2016. It was preceded by the 19th National Assembly of South Korea and succeeded by the 21st National Assembly of South Korea.

## Composition

In the 2016 legislative election, four political parties were elected to the Assembly. As of 2017, three additional parties were newly established.
| Party | Party | Original elected seats | Original elected seats | Original elected seats | Current seats | Current seats | Current seats |
| Party | Party | Con. | PR | Total | ± | Total | % |
| | Democratic Party | 110 | 13 | 123 | -3 | 120 | 41.38% |
| | United Future Party | 105 | 17 | 122 | -30 | 92 | 31.72% |
| | People's Party | 25 | 13 | 38 | — | — | |
| | Minsaeng Party | — | — | — | — | 20 | 6.90% |
| | Future Korea Party | — | — | — | — | 20 | 6.90% |
| | Platform Party | — | — | — | — | 8 | 2.76% |
| | Justice Party | 2 | 4 | 6 | 0 | 6 | 2.07% |
| | Our Republican Party | — | — | — | — | 2 | 0.69% |
| | Open Democratic Party | — | — | — | — | 1 | 0.3% |
| | Minjung Party | — | — | — | — | 1 | 0.3% |
| | Korean Economic Party | — | — | — | — | 1 | 0.3% |
| | People Party | — | — | — | — | 1 | 0.3% |
| | Pro-Park New Party | — | — | — | — | 1 | 0.3% |
| | Independent | 11 | — | 11 | +6 | 17 | 5.86% |
| Totals | Totals | 253 | 47 | 300 | -10 | 290 | 100.0% |

## Members elected in the 2016 election

The following are the National Assembly members who were elected in the 2016 South Korean legislative election.
| Province/city | Constituency | Member | Party |
| Seoul | Jongno | Chung Sye-kyun | Democratic Party |
| Seoul | Jung–Seongdong A | Hong Ihk-pyo | Democratic Party |
| Seoul | Jung–Seongdong B | Ji Sang-wook | Saenuri Party |
| Seoul | Yongsan | Chin Young | Democratic Party |
| Seoul | Gwangjin A | Jeon Hye-sook | Democratic Party |
| Seoul | Gwangjin B | Choo Mi-ae | Democratic Party |
| Seoul | Dongdaemun A | Ahn Gyu-back | Democratic Party |
| Seoul | Dongdaemun B | Min Byung-doo | Democratic Party |
| Seoul | Jungnang A | Seo Young-kyo | Democratic Party |
| Seoul | Jungnang B | Park Hong-keun | Democratic Party |
| Seoul | Seongbuk A | You Seung-hee | Democratic Party |
| Seoul | Seongbuk B | Ki Dong-min | Democratic Party |
| Seoul | Gangbuk A | Cheong Yang-seog | Saenuri Party |
| Seoul | Gangbuk B | Park Yong-jin | Democratic Party |
| Seoul | Dobong A | In Jae-keun | Democratic Party |
| Seoul | Dobong B | Kim Seon-dong | Saenuri Party |
| Seoul | Nowon A | Koh Yong-jin | Democratic Party |
| Seoul | Nowon B | Woo Won-shik | Democratic Party |
| Seoul | Nowon C | Ahn Cheol-soo | People Party |
| Seoul | Eunpyeong A | Park Joo-min | Democratic Party |
| Seoul | Eunpyeong B | Kang Byung-won | Democratic Party |
| Seoul | Seodaemun A | Woo Sang-ho | Democratic Party |
| Seoul | Seodaemun B | Kim Yeong-ho | Democratic Party |
| Seoul | Mapo A | Noh Woong-rae | Democratic Party |
| Seoul | Mapo B | Sohn Hye-won | Democratic Party |
| Seoul | Yangcheon A | Hwang Hee | Democratic Party |
| Seoul | Yangcheon B | Kim Yong-tae | Saenuri Party |
| Seoul | Gangseo A | Geum Tae-seop | Democratic Party |
| Seoul | Gangseo B | Kim Sung-tae | Saenuri Party |
| Seoul | Gangseo C | Han Jeoung-ae | Democratic Party |
| Seoul | Guro A | Lee In-young | Democratic Party |
| Seoul | Guro B | Park Young-sun | Democratic Party |
| Seoul | Geumcheon | Lee Hoon | Democratic Party |
| Seoul | Yeongdeungpo A | Kim Young-joo | Democratic Party |
| Seoul | Yeongdeungpo B | Shin Kyoung-min | Democratic Party |
| Seoul | Dongjak A | Kim Byung-kee | Democratic Party |
| Seoul | Dongjak B | Na Kyung-won | Saenuri Party |
| Seoul | Gwanak A | Kim Sung-shik | People Party |
| Seoul | Gwanak B | Oh Shin-hwan | Saenuri Party |
| Seoul | Seocho A | Lee Hye-hoon | Saenuri Party |
| Seoul | Seocho B | Park Seong-joong | Saenuri Party |
| Seoul | Gangnam A | Lee Jong-gu | Saenuri Party |
| Seoul | Gangnam B | Jun Hyeon-hee | Democratic Party |
| Seoul | Gangnam C | Lee Eun-jae | Saenuri Party |
| Seoul | Songpa A | Park In-sook | Saenuri Party |
| Seoul | Songpa B | Choi Myeong-gil | Democratic Party |
| Seoul | Songpa C | Nam In-soon | Democratic Party |
| Seoul | Gangdong A | Jin Sun-mee | Democratic Party |
| Seoul | Gangdong B | Shim Jae-kwon | Democratic Party |
| Busan | Jung–Yeongdo | Kim Moo-sung | Saenuri Party |
| Busan | Seo–Dong | Yoo Ki-june | Saenuri Party |
| Busan | Busanjin A | Kim Young-choon | Democratic Party |
| Busan | Busanjin B | Lee Hun-seung | Saenuri Party |
| Busan | Dongnae | Lee Jin-bok | Saenuri Party |
| Busan | Nam A | Kim Jung-hoon | Saenuri Party |
| Busan | Nam B | Park Jae-ho | Democratic Party |
| Busan | Buk–Gangseo A | Chun Jae-soo | Democratic Party |
| Busan | Buk–Gangseo B | Kim Do-eup | Saenuri Party |
| Busan | Haeundae A | Ha Tae-keung | Saenuri Party |
| Busan | Haeundae B | Bae Duk-kwang | Saenuri Party |
| Busan | Saha A | Choi In-ho | Democratic Party |
| Busan | Saha B | Cho Kyoung-tae | Democratic Party |
| Busan | Geumjeong | Kim Se-yeon | Saenuri Party |
| Busan | Yeonje | Kim Hae-young | Democratic Party |
| Busan | Suyeong | Yoo Jae-jung | Saenuri Party |
| Busan | Sasang | Chang Jae-won | Independent |
| Busan | Gijang | Yoon Sang-jik | Saenuri Party |
| Daegu | Jung–Nam | Kwak Sang-do | Saenuri Party |
| Daegu | Dong A | Chong Jong-sup | Saenuri Party |
| Daegu | Dong B | Yoo Seong-min | Independent |
| Daegu | Seo | Kim Sang-hoon | Saenuri Party |
| Daegu | Buk A | Jeong Tae-ok | Saenuri Party |
| Daegu | Buk B | Hong Eui-rak | Independent |
| Daegu | Suseong A | Kim Boo-kyum | Democratic Party |
| Daegu | Suseong B | Joo Ho-young | Independent |
| Daegu | Dalseo A | Kwak Dae-hoon | Saenuri Party |
| Daegu | Dalseo B | Yoon Jae-ok | Saenuri Party |
| Daegu | Dalseo C | Cho Won-jin | Saenuri Party |
| Daegu | Dalseong | Choo Kyung-ho | Saenuri Party |
| Incheon | Jung–Dong–Ganghwa–Ongjin | Ahn Sang-soo | Independent |
| Incheon | Nam A | Hong Il-pyo | Saenuri Party |
| Incheon | Nam B | Yoon Sang-hyun | Independent |
| Incheon | Yeonsu A | Park Chan-dae | Democratic Party |
| Incheon | Yeonsu B | Min Kyung-wook | Saenuri Party |
| Incheon | Namdong A | Park Nam-choon | Democratic Party |
| Incheon | Namdong B | Youn Kwan-suk | Democratic Party |
| Incheon | Bupyeong A | Jung Yu-seok | Saenuri Party |
| Incheon | Bupyeong B | Hong Young-pyo | Democratic Party |
| Incheon | Gyeyang A | Yu Dong-su | Democratic Party |
| Incheon | Gyeyang B | Song Young-gil | Democratic Party |
| Incheon | Seo A | Lee Hag-jae | Saenuri Party |
| Incheon | Seo B | Shin Dong-kun | Democratic Party |
| Gwangju | Dong–Nam A | Chang Byoung-wan | People Party |
| Gwangju | Dong–Nam B | Park Joo-sun | People Party |
| Gwangju | Seo A | Song Gi-seok | People Party |
| Gwangju | Seo B | Chun Jung-bae | People Party |
| Gwangju | Buk A | Kim Gyeong-jin | People Party |
| Gwangju | Buk B | Choi Gyeong-hwan | People Party |
| Gwangju | Gwangsan A | Kim Dong-cheol | People Party |
| Gwangju | Gwangsan B | Gwon Eun-hui | People Party |
| Daejeon | Dong | Lee Jang-woo | Saenuri Party |
| Daejeon | Jung | Lee Eun-gwon | Saenuri Party |
| Daejeon | Seo A | Park Byeong-seug | Democratic Party |
| Daejeon | Seo B | Park Beom-kye | Democratic Party |
| Daejeon | Yuseong | Jo Seung-rae | Democratic Party |
| Daejeon | Yuseong B | Lee Sang-min | Democratic Party |
| Daejeon | Daedeok | Park Seoung-hyo | Saenuri Party |
| Ulsan | Jung | Jeong Kab-yoon | Saenuri Party |
| Ulsan | Nam A | Lee Chae-ik | Saenuri Party |
| Ulsan | Nam B | Park Maeng-woo | Saenuri Party |
| Ulsan | Dong | Kim Jong-hoon | Independent |
| Ulsan | Buk | Yoon Jong-oh | Independent |
| Ulsan | Ulju | Kang Ghil-boo | Independent |
| Sejong | Sejong | Lee Hae-chan | Independent |
| Gyeonggi Province | Suwon A | Lee Chan-yeol | Democratic Party |
| Gyeonggi Province | Suwon B | Baek Hye-ryun | Democratic Party |
| Gyeonggi Province | Suwon C | Kim Yeong-jin | Democratic Party |
| Gyeonggi Province | Suwon D | Park Kwang-on | Democratic Party |
| Gyeonggi Province | Suwon E | Kim Jin-pyo | Democratic Party |
| Gyeonggi Province | Sujeong, Seongnam | Kim Tae-nyeon | Democratic Party |
| Gyeonggi Province | Jungwon, Seongnam | Shin Sang-jin | Saenuri Party |
| Gyeonggi Province | Bundang A, Seongnam | Kim Byung-gwan | Democratic Party |
| Gyeonggi Province | Bundang B, Seongnam | Kim Byung-uk | Democratic Party |
| Gyeonggi Province | Uijeongbu A | Moon Hee-sang | Democratic Party |
| Gyeonggi Province | Uijeongbu B | Hong Mun-jong | Saenuri Party |
| Gyeonggi Province | Manan, Anyang | Lee Jong-kul | Democratic Party |
| Gyeonggi Province | Dongan A, Anyang | Lee Seok-hyun | Democratic Party |
| Gyeonggi Province | Dongan B, Anyang | Shim Jae-chul | Saenuri Party |
| Gyeonggi Province | Wonmi A, Bucheon | Kim Gyeong-hyeop | Democratic Party |
| Gyeonggi Province | Wonmi B, Bucheon | Sul Hoon | Democratic Party |
| Gyeonggi Province | Sosa, Bucheon | Kim Sang-hee | Democratic Party |
| Gyeonggi Province | Ojeong, Bucheon | Won Hye-young | Democratic Party |
| Gyeonggi Province | Gwangmyeong A | Baek Jae-hyun | Democratic Party |
| Gyeonggi Province | Gwangmyeong B | Lee Un-ju | Saenuri Party |
| Gyeonggi Province | Pyeongtaek A | Won Yoo-chul | Saenuri Party |
| Gyeonggi Province | Pyeongtaek B | Yoo Ui-dong | Saenuri Party |
| Gyeonggi Province | Sangnok A, Ansan | Jeon Hae-cheol | Democratic Party |
| Gyeonggi Province | Sangnok B, Ansan | Kim Cheol-min | Democratic Party |
| Gyeonggi Province | Danwon A, Ansan | Kim Myung-yeon | Saenuri Party |
| Gyeonggi Province | Danwon B, Ansan | Park Sun-ja | Saenuri Party |
| Gyeonggi Province | Goyang A | Sim Sang-jung | Justice Party |
| Gyeonggi Province | Goyang B | Jung Jae-ho | Democratic Party |
| Gyeonggi Province | Goyang C | Yoo Eun-hae | Democratic Party |
| Gyeonggi Province | Goyang D | Kim Hyun-mee | Democratic Party |
| Gyeonggi Province | Namyangju A | Cho Eung-chun | Democratic Party |
| Gyeonggi Province | Namyangju B | Kim Han-jeong | Democratic Party |
| Gyeonggi Province | Namyangju C | Joo Kwang-deok | Saenuri Party |
| Gyeonggi Province | Siheung A | Ham Jin-kyu | Saenuri Party |
| Gyeonggi Province | Siheung B | Cho Jeong-sik | Democratic Party |
| Gyeonggi Province | Gunpo A | Kim Jeong-woo | Democratic Party |
| Gyeonggi Province | Gunpo B | Lee Hak-yeong | Democratic Party |
| Gyeonggi Province | Yongin A | Lee Woo-hyun | Saenuri Party |
| Gyeonggi Province | Yongin B | Kim Min-gi | Democratic Party |
| Gyeonggi Province | Yongin C | Han Sun-kyo | Saenuri Party |
| Gyeonggi Province | Yongin D | Pyo Chang-won | Democratic Party |
| Gyeonggi Province | Paju A | Yoon Hu-duk | Democratic Party |
| Gyeonggi Province | Paju B | Park Jeong | Democratic Party |
| Gyeonggi Province | Gimpo A | Kim Doo-kwan | Democratic Party |
| Gyeonggi Province | Gimpo B | Hong Chul-ho | Saenuri Party |
| Gyeonggi Province | Hwaseong A | Seo Chung-won | Saenuri Party |
| Gyeonggi Province | Hwaseong B | Lee Won-uk | Democratic Party |
| Gyeonggi Province | Hwaseong C | Kwon Chil-seung | Democratic Party |
| Gyeonggi Province | Gwangju A | So Byeong-hun | Democratic Party |
| Gyeonggi Province | Gwangju B | Im Jong-seong | Democratic Party |
| Gyeonggi Province | Guri | Yun Ho-jung | Democratic Party |
| Gyeonggi Province | Osan | An Min-suk | Democratic Party |
| Gyeonggi Province | Hanam | Lee Hyun-jae | Saenuri Party |
| Gyeonggi Province | Icheon | Song Seok-jun | Saenuri Party |
| Gyeonggi Province | Anseong | Kim Hak-yong | Saenuri Party |
| Gyeonggi Province | Yangju | Chung Seong-ho | Democratic Party |
| Gyeonggi Province | Uiwang–Gwacheon | Sim Chang-hyeon | Democratic Party |
| Gyeonggi Province | Dongducheon–Yeoncheon | Kim Seong-won | Saenuri Party |
| Gyeonggi Province | Pocheon–Gapyeong | Kim Young-woo | Saenuri Party |
| Gyeonggi Province | Yeoju–Yangpyeong | Choung Byoung-gug | Saenuri Party |
| Gangwon Province | Chuncheon | Kim Jin-tae | Saenuri Party |
| Gangwon Province | Wonju A | Kim Ki-sun | Saenuri Party |
| Gangwon Province | Wonju B | Song Ki-hun | Democratic Party |
| Gangwon Province | Gangneung | Kweon Seong-dong | Saenuri Party |
| Gangwon Province | Donghae–Samcheok | Lee Chul-gyu | Independent |
| Gangwon Province | Taebaek–Hoengseong–Yeongwol–Pyeongchang–Jeongseon | Yeom Dong-yeol | Saenuri Party |
| Gangwon Province | Sokcho–Goseong–Yangyang | Lee Yang-su | Saenuri Party |
| Gangwon Province | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje | Hwang Young-cheul | Saenuri Party |
| North Chungcheong Province | Sangdang, Cheongju | Chung Woo-taik | Saenuri Party |
| North Chungcheong Province | Seowon, Cheongju | Oh Jae-sae | Democratic Party |
| North Chungcheong Province | Heungdeok, Cheongju | Do Jong-hwan | Democratic Party |
| North Chungcheong Province | Cheongwon, Cheongju | Byun Jae-ill | Democratic Party |
| North Chungcheong Province | Chungju | Lee Jong-bae | Saenuri Party |
| North Chungcheong Province | Jecheon–Danyang | Gwon Seok-chang | Democratic Party |
| North Chungcheong Province | Boeun–Okcheon–Yeongdong–Goesan | Park Deok-hyum | Saenuri Party |
| North Chungcheong Province | Jeungpyeong–Jincheon–Eumseong | Kyung Dae-soo | Saenuri Party |
| South Chungcheong Province | Cheonan A | Park Chan-woo | Saenuri Party |
| South Chungcheong Province | Cheonan B | Park Wan-ju | Democratic Party |
| South Chungcheong Province | Cheonan C | Yang Seoung-jo | Democratic Party |
| South Chungcheong Province | Gongju–Buyeo–Cheongyang | Chung Jin-suk | Saenuri Party |
| South Chungcheong Province | Boryeong–Seocheon | Kim Tae-heum | Saenuri Party |
| South Chungcheong Province | Asan A | Lee Myoung-su | Saenuri Party |
| South Chungcheong Province | Asan B | Kang Hun-sik | Democratic Party |
| South Chungcheong Province | Seosan–Taean | Sung Il-jong | Saenuri Party |
| South Chungcheong Province | Nonsan–Gyeryong–Geumsan | Kim Jong-min | Democratic Party |
| South Chungcheong Province | Dangjin | Eo Ki-kyu | Democratic Party |
| South Chungcheong Province | Hongseong–Yesan | Hong Moon-pyo | Saenuri Party |
| North Jeolla Province | Jeonju A | Kim Gwang-su | People Party |
| North Jeolla Province | Jeonju B | Chung Woon-chun | Saenuri Party |
| North Jeolla Province | Jeonju C | Chung Dong-young | People Party |
| North Jeolla Province | Gunsan | Kim Kwan-young | People Party |
| North Jeolla Province | Iksan A | Lee Choon-suak | Democratic Party |
| North Jeolla Province | Iksan B | Cho Bae-sook | People Party |
| North Jeolla Province | Jeongeup–Gochang | Yu Sung-yup | People Party |
| North Jeolla Province | Namwon–Imsil–Sunchang | Lee Yong-ho | People Party |
| North Jeolla Province | Gimje–Buan | Kim Jong-hee | People Party |
| North Jeolla Province | Wanju–Jinan–Muju–Jangsu | An Ho-young | Democratic Party |
| South Jeolla Province | Mokpo | Park Jie-won | People Party |
| South Jeolla Province | Yeosu A | Lee Yong-ju | People Party |
| South Jeolla Province | Yeosu B | Joo Seung-yong | People Party |
| South Jeolla Province | Suncheon | Lee Jung-hyun | Saenuri Party |
| South Jeolla Province | Naju–Hwasun | Son Kum-ju | People Party |
| South Jeolla Province | Gwangyang–Gokseong–Gurye | Jeong In-hwa | People Party |
| South Jeolla Province | Damyang–Hwapyeong–Yeonggwang–Jangseong | Lee Kai-ho | Democratic Party |
| South Jeolla Province | Goheung–Boseong–Jangheung–Gangjin | Hwang Ju-hong | People Party |
| South Jeolla Province | Haenam–Wando–Jindo | Yoon Young-il | People Party |
| South Jeolla Province | Yeongam–Muan–Sinan | Park Jun-yeong | People Party |
| North Gyeongsang Province | Buk, Pohang | Kim Jeong-jae | Saenuri Party |
| North Gyeongsang Province | Nam, Pohang–Ulleung | Park Myung-jae | Saenuri Party |
| North Gyeongsang Province | Gyeongju | Kim Seok-ki | Saenuri Party |
| North Gyeongsang Province | Gimcheon | Lee Cheol-woo | Saenuri Party |
| North Gyeongsang Province | Andong | Kim Kwang-lim | Saenuri Party |
| North Gyeongsang Province | Gyeongsan | Choi Kyoung-hwan | Saenuri Party |
| North Gyeongsang Province | Gumi A | Baek Seung-joo | Saenuri Party |
| North Gyeongsang Province | Gumi B | Chang Seok-chun | Saenuri Party |
| North Gyeongsang Province | Yeongju–Mungyeong–Yecheon | Choi Gyo-il | Saenuri Party |
| North Gyeongsang Province | Yeongcheon–Cheongdo | Lee Man-hee | Saenuri Party |
| North Gyeongsang Province | Sangju–Gunwi–Uiseong–Cheongsong | Kim Jong-tae | Saenuri Party |
| North Gyeongsang Province | Yeongyang–Yeongdeok–Bonghwa–Uljin | Kang Seok-ho | Saenuri Party |
| North Gyeongsang Province | Goryeong–Seongju–Chilgok | Yi Wan-young | Saenuri Party |
| South Gyeongsang Province | Uichang, Changwon | Park Wan-su | Saenuri Party |
| South Gyeongsang Province | Seongsan, Changwon | Roh Hoe-chan | Justice Party |
| South Gyeongsang Province | Masanhappo, Changwon | Lee Ju-young | Saenuri Party |
| South Gyeongsang Province | Masanhoewon, Changwon | Yoon Han-hong | Saenuri Party |
| South Gyeongsang Province | Jinhae, Changwon | Kim Sung-chan | Saenuri Party |
| South Gyeongsang Province | Jinju A | Park Dae-chul | Saenuri Party |
| South Gyeongsang Province | Jinju B | Kim Jae-kyung | Saenuri Party |
| South Gyeongsang Province | Tongyeong–Goseong | Lee Gun-hyeon | Saenuri Party |
| South Gyeongsang Province | Sacheon–Namhae–Hadong | Yeo Sang-gyu | Saenuri Party |
| South Gyeongsang Province | Gimhae A | Min Hong-chul | Democratic Party |
| South Gyeongsang Province | Gimhae B | Kim Kyung-soo | Democratic Party |
| South Gyeongsang Province | Miryang–Uiryeong–Haman–Changnyeong | Um Yong-su | Saenuri Party |
| South Gyeongsang Province | Geoje | Kim Han-pyo | Saenuri Party |
| South Gyeongsang Province | Yangsan A | Yoon Young-suk | Saenuri Party |
| South Gyeongsang Province | Yangsan B | Seo Hyung-soo | Democratic Party |
| South Gyeongsang Province | Sancheong–Hamyang–Geochang–Hapcheon | Kang Seok-jin | Saenuri Party |
| Jeju Province | Jeju City A | Kang Chang-il | Democratic Party |
| Jeju Province | Jeju City B | Oh Young-hun | Democratic Party |
| Jeju Province | Seogwipo | Wi Seong-gon | Democratic Party |
| National | Proportional representation | Song Hee-kyung | Saenuri Party |
| National | Proportional representation | Lee Jong-myung | Saenuri Party |
| National | Proportional representation | Lim Lee-ja | Saenuri Party |
| National | Proportional representation | Moon Jin-guk | Saenuri Party |
| National | Proportional representation | Choi Yeon-hye | Saenuri Party |
| National | Proportional representation | Kim Gyu-hwan | Saenuri Party |
| National | Proportional representation | Shin Bo-ra | Saenuri Party |
| National | Proportional representation | Kim Sung-tae | Saenuri Party |
| National | Proportional representation | Jeon Hee-gyeong | Saenuri Party |
| National | Proportional representation | Kim Jong-suk | Saenuri Party |
| National | Proportional representation | Kim Seung-hee | Saenuri Party |
| National | Proportional representation | Yoo Min-bong | Saenuri Party |
| National | Proportional representation | Yun Jong-pil | Saenuri Party |
| National | Proportional representation | Cho Hoon-hyun | Saenuri Party |
| National | Proportional representation | Kim Sun-rye | Saenuri Party |
| National | Proportional representation | Kang Hyo-sang | Saenuri Party |
| National | Proportional representation | Kim Hyun-ah | Saenuri Party |
| National | Proportional representation | Shin Yong-hyeon | People Party |
| National | Proportional representation | Oh Se-jung | People Party |
| National | Proportional representation | Park Joo-hyun | People Party |
| National | Proportional representation | Lee Sang-don | People Party |
| National | Proportional representation | Park Sun-sook | People Party |
| National | Proportional representation | Chae Yi-bae | People Party |
| National | Proportional representation | Kim Su-min | People Party |
| National | Proportional representation | Lee Tae-gyu | People Party |
| National | Proportional representation | Kim Sam-hwa | People Party |
| National | Proportional representation | Kim Jung-ro | People Party |
| National | Proportional representation | Chang Jeong-suk | People Party |
| National | Proportional representation | Lee Dong-seop | People Party |
| National | Proportional representation | Choi Do-ja | People Party |
| National | Proportional representation | Park Kyung-mi | Democratic Party |
| National | Proportional representation | Kim Chong-in | Democratic Party |
| National | Proportional representation | Song Ok-ju | Democratic Party |
| National | Proportional representation | Choi Woon-yeol | Democratic Party |
| National | Proportional representation | Lee Jae-jeong | Democratic Party |
| National | Proportional representation | Kim Hyun-kwon | Democratic Party |
| National | Proportional representation | Mun Mi-ock | Democratic Party |
| National | Proportional representation | Lee Chul-hee | Democratic Party |
| National | Proportional representation | Je Youn-kyung | Democratic Party |
| National | Proportional representation | Kim Sung-soo | Democratic Party |
| National | Proportional representation | Kwon Mi-hyuk | Democratic Party |
| National | Proportional representation | Lee Yong-deuk | Democratic Party |
| National | Proportional representation | Jung Choun-sook | Democratic Party |
| National | Proportional representation | Lee Jung-mi | Justice Party |
| National | Proportional representation | Kim Jong-dae | Justice Party |
| National | Proportional representation | Chu Hye-seon | Justice Party |
| National | Proportional representation | Yun So-ha | Justice Party |

## Changes since the 2016 election
### Changes in membership

| Date | Constituency | Incumbent | Party | New member | Party | Party | Notes |
| 14 March 2017 | Proportional representation | Kim Chong-in | Democratic | Shim Gi-jun | | Democratic | Incumbent lost seat on 8 March 2017; replaced by the next member in the Democratic list. |
| 13 April 2017 | Sangju–Gunwi–Uiseong–Cheongsong, North Gyeongsang Province | Kim Jong-tae | Saenuri | Seo Gi-ho | | Saenuri | Incumbent lost seat on 9 February 2017 for election law violations. New member by-elected. |
| 22 June 2017 | Proportional representation | Mun Mi-ock | Democratic | Lee Su-hyeok | | Democratic | Incumbent resigned on 20 June 2017 upon appointment as Advisor to the President for Science and Technology; replaced by the next member in the Democratic list. |
| 13 June 2018 | Nowon C, Seoul | Ahn Cheol-soo | People | Kim Seong-hwan | | Democratic | Incumbent resigned on 17 April 2017 to run in the 2017 South Korean presidential election. New member by-elected. |
| 13 June 2018 | Songpa B, Seoul | Choi Myeong-gil | People | Choi Jae-seong | | Democratic | Incumbent lost seat on 5 December 2017 for election law violations. New member by-elected. |
| 13 June 2018 | Haeundae B, Busan | Bae Duk-kwang | Liberty Korea | Yun Jun-ho | | Democratic | Incumbent resigned on 23 January 2018 for private reason. New member by-elected. |
| 13 June 2018 | Namdong A, Incheon | Park Nam-choon | Democratic | Maeng Seong-kyu | | Democratic | Incumbent resigned on 14 May 2018 to run in the 2018 Incheon mayoral election. New member by-elected. |
| 13 June 2018 | Seo A, Gwangju | Song Gi-seok | People | Song Gap-seok | | Democratic | Incumbent lost seat on 8 February 2018 for election law violations. New member by-elected. |
| 13 June 2018 | Buk, Ulsan | Yoon Jong-oh | Minjung | Lee Sang-hoon | | Democratic | Incumbent lost seat on 22 December 2017 for election law violations. New member by-elected. |
| 13 June 2018 | Jecheon–Danyang, North Chungcheong Province | Gwon Seok-chang | Liberty Korea | Lee Hu-sam | | Democratic | Incumbent lost seat on 11 May 2018 for election law violations. New member by-elected. |
| 13 June 2018 | Cheonan A, South Chungcheong Province | Park Chan-woo | Liberty Korea | Lee Gyu-hee | | Democratic | Incumbent lost seat on 13 February 2018 for election law violations. New member by-elected. |
| 13 June 2018 | Cheonan C, South Chungcheong Province | Yang Seoung-jo | Democratic | Yun Il-gyu | | Democratic | Incumbent resigned on 14 May 2018 to run in the 2018 South Chungcheong Province gubernatorial election. New member by-elected. |
| 13 June 2018 | Yeongam–Muan–Sinan, South Jeolla Province | Park Jun-yeong | Democracy and Peace | Seo Sam-seok | | Democratic | Incumbent lost seat on 8 February 2018 for election law violations. New member by-elected. |
| 13 June 2018 | Gimcheon, North Gyeongsang Province | Lee Cheol-woo | Liberty Korea | Song Eon-seok | | Liberty Korea | Incumbent resigned on 14 May 2018 to run in the 2018 North Gyeongsang Province gubernatorial election. New member by-elected. |
| 13 June 2018 | Gimhae B, South Gyeongsang Province | Kim Kyung-soo | Democratic | Kim Jeong-ho | | Democratic | Incumbent resigned on 14 May 2018 to run in the 2018 South Gyeongsang Province gubernatorial election. New member by-elected. |
| 2 October 2018 | Proportional representation | Oh Se-jung | Bareunmirae | Lim Jae-hoon | | Bareunmirae (from People list) | Incumbent resigned on 1 October 2018 to run in the election of the president of the Seoul National University; replaced by the next member in the former People list. |
| 3 April 2019 | Seongsan, Changwon, South Gyeongsang Province | Roh Hoe-chan | Justice Party | Yeo Yeong-gug | | Justice Party | Incumbent died on 23 July 2018. New member by-elected. |
| 3 April 2019 | Tongyeong–Goseong, South Gyeongsang Province | Lee Gun-hyeon | Liberty Korea | Jeong Jeom-sik | | Liberty Korea | Incumbent lost seat on 27 December 2018 for election law violations. New member by-elected. |
| 30 May 2019 | Yongin A, Gyeonggi Province | Lee Woo-hyun | Liberty Korea | Seat remained vacant. | Seat remained vacant. | Seat remained vacant. | Incumbent lost seat on 30 May 2019 for political funding law violations. |
| 13 June 2019 | Goryeong–Seongju–Chilgok, North Gyeongsang Province | Yi Wan-young | Liberty Korea | Seat remained vacant. | Seat remained vacant. | Seat remained vacant. | Incumbent lost seat on 13 June 2019 for political funding law violations. |
| 11 July 2019 | Gyeongsan, North Gyeongsang Province | Choi Kyoung-hwan | Liberty Korea | Seat remained vacant. | Seat remained vacant. | Seat remained vacant. | Incumbent lost seat on 11 July 2019 for political funding law violations. |
| 11 October 2019 | Proportional representation | Lee Su-hyeok | Democratic | Jung Eun-hye | | Democratic | Incumbent resigned on 10 October 2019 upon appointment as ambassador of South Korea to the United States; replaced by the next member in the Democratic list. |
| 31 October 2019 | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje, Gangwon Province | Hwang Young-cheul | Liberty Korea | Seat remained vacant. | Seat remained vacant. | Seat remained vacant. | Incumbent lost seat on 31 October 2019 for political funding law violations. |
| 15 November 2019 | Miryang–Uiryeong–Haman–Changnyeong, South Gyeongsang Province | Um Yong-su | Liberty Korea | Seat remained vacant. | Seat remained vacant. | Seat remained vacant. | Incumbent lost seat on 15 November 2019 for political funding law violations. |
| 31 January 2020 | Proportional representation | Kim Sung-soo | Democratic | Huh Yoon-jung | | Democratic | Incumbent resigned on 30 January 2020 following appointment as Chief of Staff of the Prime Minister's Secretariat; replaced by the next member in the Democratic list. |
| 19 March 2020 | Proportional representation | Kim Su-min | Minsaeng | Seat remained vacant. | Seat remained vacant. | Seat remained vacant. | Incumbent lost seat on 19 March 2020. |
| 19 March 2020 | Proportional representation | Kim Sam-hwa | Minsaeng | Seat remained vacant. | Seat remained vacant. | Seat remained vacant. | Incumbent lost seat on 19 March 2020. |
| 19 March 2020 | Proportional representation | Kim Jung-ro | Minsaeng | Seat remained vacant. | Seat remained vacant. | Seat remained vacant. | Incumbent lost seat on 19 March 2020. |
| 19 March 2020 | Proportional representation | Lee Dong-seop | Minsaeng | Seat remained vacant. | Seat remained vacant. | Seat remained vacant. | Incumbent lost seat on 19 March 2020. |

### Changes in party affiliation

| Date | Member | Constituency | Old party | New party | Notes |
| 6 June 2016 | Kim Hyung-tae | Nam, Pohang–Ulleung, North Gyeongsang Province | Democratic | Independent | Left the Democratic Party on election as Speaker of the National Assembly. |
| 16 June 2016 | Yoo Seong-min | Dong A, Daegu | Independent | Saenuri | Returned to the Saenuri Party. |
| 16 June 2016 | Ahn Sang-soo | Jung–Dong–Ganghwa–Ongjin, Incheon | Independent | Saenuri | Returned to the Saenuri Party. |
| 16 June 2016 | Yoon Sang-hyun | Nam B, Incheon | Independent | Saenuri | Returned to the Saenuri Party. |
| 16 June 2016 | Kang Ghil-boo | Ulju, Ulsan | Independent | Saenuri | Returned to the Saenuri Party. |
| 20 June 2016 | Chang Je-won | Sasang, Busan | Independent | Saenuri | Returned to the Saenuri Party. |
| 21 June 2016 | Joo Ho-young | Suseong B, Daegu | Independent | Saenuri | Returned to the Saenuri Party. |
| 21 June 2016 | Lee Chul-gyu | Donghae–Samcheok, Gangwon Province | Independent | Saenuri | Returned to the Saenuri Party. |
| 11 July 2016 | Seo Young-kyo | Jungnang A, Seoul | Democratic | Independent | Left the Democratic Party. |
| 30 September 2016 | Lee Hae-chan | Sejong | Independent | Democratic | Returned to the Democratic Party. |
| 21 October 2016 | Lee Chan-yeol | Suwon A, Gyeonggi Province | Democratic | Independent | Left the Democratic Party. |
| 22 November 2016 | Kim Yong-tae | Yangcheon B, Seoul | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Cheong Yang-seog | Gangbuk A, Seoul | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Kim Sung-tae | Gangseo B, Seoul | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Oh Shin-hwan | Gwanak B, Seoul | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Lee Hye-hoon | Seocho A, Seoul | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Park Seong-joong | Seocho B, Seoul | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Lee Jong-gu | Gangnam A, Seoul | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Lee Eun-jae | Gangnam C, Seoul | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Park In-sook | Songpa A, Seoul | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Kim Moo-sung | Jung–Yeongdo, Busan | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Lee Jin-bok | Dongnae, Busan | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Ha Tae-keung | Haeundae A, Busan | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Kim Se-yeon | Geumjeong, Busan | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Chang Je-won | Sasang, Busan | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Yoo Seong-min | Dong A, Daegu | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Joo Ho-young | Suseong B, Daegu | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Hong Il-pyo | Nam A, Incheon | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Lee Hag-jae | Seo A, Incheon | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Kang Ghil-boo | Ulju, Ulsan | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Yu Eui-dong | Pyeongtaek B, Gyeonggi Province | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Kim Hak-yong | Anseong, Gyeonggi Province | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Kim Young-woo | Pocheon–Gapyeong, Gyeonggi Province | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Choung Byoung-gug | Yeoju–Yangpyeong, Gyeonggi Province | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Kweon Seong-dong | Gangneung, Gangwon Province | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Hwang Young-cheul | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje, Gangwon Province | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Hong Moon-pyo | Hongseong–Yesan, South Chungcheong Province | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Chung Woon-chun | Jeonju B, North Jeolla Province | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Kim Jae-kyung | Jinju B, South Gyeongsang Province | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Lee Gun-hyeon | Tongyeong–Goseong, South Gyeongsang Province | Saenuri | Independent | Left the Saenuri Party. |
| 27 December 2016 | Yeo Sang-gyu | Sacheon–Namhae–Hadong, South Gyeongsang Province | Saenuri | Independent | Left the Saenuri Party. |
| 2 January 2017 | Lee Jung-hyun | Suncheon, South Jeolla Province | Saenuri | Independent | Left the Saenuri Party. |
| 4 January 2017 | Jeong Kab-yoon | Jung, Ulsan | Saenuri | Independent | Left the Saenuri Party. |
| 23 January 2017 | Park Sun-ja | Danwon B, Ansan, Gyeonggi Province | Saenuri | Independent | Left the Saenuri Party. |
| 24 January 2017 | Cheong Yang-seog | Gangbuk A, Seoul | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Kim Yong-tae | Yangcheon B, Seoul | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Kim Sung-tae | Gangseo B, Seoul | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Oh Shin-hwan | Gwanak B, Seoul | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Lee Hye-hoon | Seocho A, Seoul | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Park Seong-joong | Seocho B, Seoul | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Lee Jong-gu | Gangnam A, Seoul | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Lee Eun-jae | Gangnam C, Seoul | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Park In-sook | Songpa A, Seoul | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Kim Moo-sung | Jung–Yeongdo, Busan | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Lee Jin-bok | Dongnae, Busan | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Ha Tae-keung | Haeundae A, Busan | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Kim Se-yeon | Geumjeong, Busan | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Chang Je-won | Sasang, Busan | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Yoo Seong-min | Dong A, Daegu | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Joo Ho-young | Suseong B, Daegu | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Hong Il-pyo | Nam A, Incheon | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Lee Hag-jae | Seo A, Incheon | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Kang Ghil-boo | Ulju, Ulsan | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Yu Eui-dong | Pyeongtaek B, Gyeonggi Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Park Sun-ja | Danwon B, Ansan, Gyeonggi Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Kim Hak-yong | Anseong, Gyeonggi Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Kim Young-woo | Pocheon–Gapyeong, Gyeonggi Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Choung Byoung-gug | Yeoju–Yangpyeong, Gyeonggi Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Kweon Seong-dong | Gangneung, Gangwon Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Hwang Young-cheul | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje, Gangwon Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Hong Moon-pyo | Hongseong–Yesan, South Chungcheong Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Chung Woon-chun | Jeonju B, North Jeolla Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Kim Jae-kyung | Jinju B, South Gyeongsang Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Lee Gun-hyeon | Tongyeong–Goseong, South Gyeongsang Province | Independent | Bareun | Formed the Bareun Party. |
| 24 January 2017 | Yeo Sang-gyu | Sacheon–Namhae–Hadong, South Gyeongsang Province | Independent | Bareun | Formed the Bareun Party. |
| 26 January 2017 | Hong Chul-ho | Gimpo B, Gyeonggi Province | Saenuri | Bareun | Left the Saenuri Party to join the Bareun Party. |
| 13 February 2017 | 94 members | – | Saenuri | Liberty Korea | Saenuri Party renamed as the Liberty Korea Party. |
| 17 February 2017 | Lee Chan-yeol | Suwon A, Gyeonggi Province | Independent | People | Joined the People Party. |
| 15 March 2017 | Ji Sang-wook | Jung–Seongdong B, Seoul | Liberty Korea | Bareun | Left the Liberty Korea Party to join the Bareun Party. |
| 29 March 2017 | Choi Myeong-gil | Songpa B, Seoul | Democratic | Independent | Left the Democratic Party. |
| 6 April 2017 | Lee Un-ju | Gwangmyeong B, Gyeonggi Province | Democratic | People | Left the Democratic Party to join the People Party. |
| 8 April 2017 | Cho Won-jin | Dalseo C, Daegu | Liberty Korea | Saenuri (2017) | Left the Liberty Korea Party to join the new pro-Park Geun-hye Saenuri Party. |
| 27 April 2017 | Choi Myeong-gil | Songpa B, Seoul | Independent | People | Joined the People Party. |
| 28 April 2017 | Lee Eun-jae | Gangnam C, Seoul | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Kim Sung-tae | Gangseo B, Seoul | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Park Seong-joong | Seocho B, Seoul | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Lee Jin-bok | Dongnae, Busan | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Chang Je-won | Sasang, Busan | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Hong Il-pyo | Nam A, Incheon | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Park Sun-ja | Danwon B, Ansan, Gyeonggi Province | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Kim Hak-yong | Anseong, Gyeonggi Province | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Kweon Seong-dong | Gangneung, Gangwon Province | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Hong Moon-pyo | Hongseong–Yesan, South Chungcheong Province | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Kim Jae-kyung | Jinju B, South Gyeongsang Province | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Lee Gun-hyeon | Tongyeong–Goseong, South Gyeongsang Province | Bareun | Independent | Left the Bareun Party. |
| 2 May 2017 | Yeo Sang-gyu | Sacheon–Namhae–Hadong, South Gyeongsang Province | Bareun | Independent | Left the Bareun Party. |
| 4 May 2017 | Hong Eui-rak | Buk B, Daegu | Independent | Democratic | Joined the Democratic Party. |
| 6 May 2017 | Kim Sung-tae | Gangseo B, Seoul | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Park Seong-joong | Seocho B, Seoul | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Lee Jin-bok | Dongnae, Busan | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Chang Je-won | Sasang, Busan | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Hong Il-pyo | Nam A, Incheon | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Jeong Kab-yoon | Jung, Ulsan | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Park Sun-ja | Danwon B, Ansan, Gyeonggi Province | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Kim Hak-yong | Anseong, Gyeonggi Province | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Kweon Seong-dong | Gangneung, Gangwon Province | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Hong Moon-pyo | Hongseong–Yesan, South Chungcheong Province | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Kim Jae-kyung | Jinju B, South Gyeongsang Province | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Lee Gun-hyeon | Tongyeong–Goseong, South Gyeongsang Province | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 6 May 2017 | Yeo Sang-gyu | Sacheon–Namhae–Hadong, South Gyeongsang Province | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 1 August 2017 | Cho Won-jin | Dalseo C, Daegu | Saenuri (2017) | Independent | Removed from the new Saenuri Party. |
| 4 September 2017 | Cho Won-jin | Dalseo C, Daegu | Independent | Korean Patriot's | Founded the pro-Park Geun-hye Korean Patriot's Party. |
| 4 September 2017 | Kim Jong-hoon | Dong, Ulsan | Independent | New People's | Formed the New People's Party. |
| 4 September 2017 | Yoon Jong-oh | Buk, Ulsan | Independent | New People's | Formed the New People's Party. |
| 13 September 2017 | Seo Young-kyo | Jungnang A, Seoul | Independent | Democratic | Returned to the Democratic Party. |
| 15 October 2017 | Kim Jong-hoon | Dong, Ulsan | New People's | Minjung | New People's Party merged into the Minjung Party. |
| 15 October 2017 | Yoon Jong-oh | Buk, Ulsan | New People's | Minjung | New People's Party merged into the Minjung Party. |
| 8 November 2017 | Cheong Yang-seog | Gangbuk A, Seoul | Bareun | Independent | Left the Bareun Party. |
| 8 November 2017 | Kim Yong-tae | Yangcheon B, Seoul | Bareun | Independent | Left the Bareun Party. |
| 8 November 2017 | Lee Jong-gu | Gangnam A, Seoul | Bareun | Independent | Left the Bareun Party. |
| 8 November 2017 | Kim Moo-sung | Jung–Yeongdo, Busan | Bareun | Independent | Left the Bareun Party. |
| 8 November 2017 | Kang Ghil-boo | Ulju, Ulsan | Bareun | Independent | Left the Bareun Party. |
| 8 November 2017 | Hong Chul-ho | Gimpo B, Gyeonggi Province | Bareun | Independent | Left the Bareun Party. |
| 8 November 2017 | Kim Young-woo | Pocheon–Gapyeong, Gyeonggi Province | Bareun | Independent | Left the Bareun Party. |
| 8 November 2017 | Hwang Young-cheul | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje, Gangwon Province | Bareun | Independent | Left the Bareun Party. |
| 9 November 2017 | Cheong Yang-seog | Gangbuk A, Seoul | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 9 November 2017 | Kim Yong-tae | Yangcheon B, Seoul | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 9 November 2017 | Lee Jong-gu | Gangnam A, Seoul | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 9 November 2017 | Kim Moo-sung | Jung–Yeongdo, Busan | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 9 November 2017 | Kang Ghil-boo | Ulju, Ulsan | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 9 November 2017 | Hong Chul-ho | Gimpo B, Gyeonggi Province | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 9 November 2017 | Kim Young-woo | Pocheon–Gapyeong, Gyeonggi Province | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 9 November 2017 | Hwang Young-cheul | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje, Gangwon Province | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 13 November 2017 | Joo Ho-young | Suseong B, Daegu | Bareun | Independent | Left the Bareun Party. |
| 14 November 2017 | Joo Ho-young | Suseong B, Daegu | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 9 January 2018 | Kim Se-yeon | Geumjeong, Busan | Bareun | Liberty Korea | Left the Bareun Party to return to the Liberty Korea Party. |
| 16 January 2016 | Park In-sook | Songpa A, Seoul | Bareun | Liberty Korea | Left the Bareun Party to return to the Liberty Korea Party. |
| 1 February 2018 | Lee Yong-ju | Yeosu A, South Jeolla Province | People | Independent | Left the People Party. |
| 4 February 2018 | Kim Gyeong-jin | Buk A, Gwangju | People | Independent | Left the People Party. |
| 4 February 2018 | Kim Gwang-su | Jeonju A, North Jeolla Province | People | Independent | Left the People Party. |
| 4 February 2018 | Yu Sung-yup | Jeongeup–Gochang, North Jeolla Province | People | Independent | Left the People Party. |
| 4 February 2018 | Kim Jong-hee | Gimje–Buan, North Jeolla Province | People | Independent | Left the People Party. |
| 4 February 2018 | Park Jie-won | Mokpo, South Jeolla Province | People | Independent | Left the People Party. |
| 4 February 2018 | Yoon Young-il | Haenam–Wando–Jindo, South Jeolla Province | People | Independent | Left the People Party. |
| 4 February 2018 | Park Jun-yeong | Yeongam–Muan–Sinan, South Jeolla Province | People | Independent | Left the People Party. |
| 5 February 2018 | Chang Byoung-wan | Dong–Nam A, Gwangju | People | Independent | Left the People Party. |
| 5 February 2018 | Chun Jung-bae | Seo B, Gwangju | People | Independent | Left the People Party. |
| 5 February 2018 | Choi Gyeong-hwan | Buk B, Gwangju | People | Independent | Left the People Party. |
| 5 February 2018 | Chung Dong-young | Jeonju C, North Jeolla Province | People | Independent | Left the People Party. |
| 5 February 2018 | Cho Bae-sook | Iksan B, North Jeolla Province | People | Independent | Left the People Party. |
| 5 February 2018 | Jeong In-hwa | Gwangyang–Gokseong–Gurye, South Jeolla Province | People | Independent | Left the People Party. |
| 5 February 2018 | Hwang Ju-hong | Goheung–Boseong–Jangheung–Gangjin, North Jeolla Province | People | Independent | Left the People Party. |
| 6 February 2018 | Chang Byoung-wan | Dong–Nam A, Gwangju | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Chun Jung-bae | Seo B, Gwangju | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Kim Gyeong-jin | Buk A, Gwangju | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Choi Gyeong-hwan | Buk B, Gwangju | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Kim Gwang-su | Jeonju A, North Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Chung Dong-young | Jeonju C, North Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Cho Bae-sook | Iksan B, North Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Yu Sung-yup | Jeongeup–Gochang, North Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Kim Jong-hee | Gimje–Buan, North Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Park Jie-won | Mokpo, South Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Lee Yong-ju | Yeosu A, South Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Jeong In-hwa | Gwangyang–Gokseong–Gurye, South Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Hwang Ju-hong | Goheung–Boseong–Jangheung–Gangjin, North Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Yoon Young-il | Haenam–Wando–Jindo, South Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 6 February 2018 | Park Jun-yeong | Yeongam–Muan–Sinan, South Jeolla Province | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. |
| 7 February 2018 | Son Kum-ju | Naju–Hwasun, South Jeolla Province | People | Independent | Left the People Party. |
| 11 February 2018 | Lee Yong-ho | Namwon–Imsil–Sunchang, North Jeolla Province | People | Independent | Left the People Party. |
| 13 February 2018 | 21 members | – | People | Bareunmirae | People Party merged into the Bareunmirae Party. |
| 13 February 2018 | 9 members | – | Bareun | Bareunmirae | Bareun Party merged into the Bareunmirae Party. |
| 6 May 2018 | Kang Ghil-boo | Ulju, Ulsan | Liberty Korea | Independent | Left the Liberty Korea Party. |
| 1 June 2018 | Chung Sye-kyun | Jongno, Seoul | Independent | Democratic | Returned to the Democratic Party after term as Speaker. |
| 10 June 2018 | Jeong Tae-ok | Buk A, Daegu | Liberty Korea | Independent | Left the Liberty Korea Party. |
| 20 June 2018 | Seo Chung-won | Hwaseong A, Gyeonggi Province | Liberty Korea | Independent | Left the Liberty Korea Party. |
| 13 July 2018 | Moon Hee-sang | Uijeongbu A, Gyeonggi Province | Democratic | Independent | Left the Democratic Party on election as Speaker of the National Assembly. |
| 18 December 2018 | Lee Hag-jae | Seo A, Incheon | Bareunmirae | Liberty Korea | Left the Bareunmirae Party to return to the Liberty Korea Party. |
| 21 January 2019 | Sohn Hye-won | Mapo B, Seoul | Democratic | Independent | Left the Democratic Party. |
| 22 January 2019 | Jeong Tae-ok | Buk A, Daegu | Independent | Liberty Korea | Returned to the Liberty Korea Party. |
| 23 April 2019 | Lee Un-ju | Gwangmyeong B, Gyeonggi Province | Bareunmirae | Independent | Left the Bareunmirae Party. |
| 17 June 2019 | Hong Mun-jong | Uijeongbu B, Gyonggi Province | Liberty Korea | Korean Patriot's | Left the Liberty Korea Party to join the Korean Patriot's Party. |
| 24 June 2019 | 2 members | – | Korean Patriot's | Our Republican | Korean Patriot's Party renamed as the Our Republican Party. |
| 16 August 2019 | Chang Byoung-wan | Dong–Nam A, Gwangju | Democracy and Peace | Independent | Left the Party for Democracy and Peace. |
| 16 August 2019 | Chun Jung-bae | Seo B, Gwangju | Democracy and Peace | Independent | Left the Party for Democracy and Peace. |
| 16 August 2019 | Kim Gyeong-jin | Buk A, Gwangju | Democracy and Peace | Independent | Left the Party for Democracy and Peace. |
| 16 August 2019 | Choi Gyeong-hwan | Buk B, Gwangju | Democracy and Peace | Independent | Left the Party for Democracy and Peace. |
| 16 August 2019 | Yu Sung-yup | Jeongeup–Gochang, North Jeolla Province | Democracy and Peace | Independent | Left the Party for Democracy and Peace. |
| 16 August 2019 | Kim Jong-hee | Gimje–Buan, North Jeolla Province | Democracy and Peace | Independent | Left the Party for Democracy and Peace. |
| 16 August 2019 | Park Jie-won | Mokpo, South Jeolla Province | Democracy and Peace | Independent | Left the Party for Democracy and Peace. |
| 16 August 2019 | Lee Yong-ju | Yeosu A, South Jeolla Province | Democracy and Peace | Independent | Left the Party for Democracy and Peace. |
| 16 August 2019 | Jeong In-hwa | Gwangyang–Gokseong–Gurye, South Jeolla Province | Democracy and Peace | Independent | Left the Party for Democracy and Peace. |
| 16 August 2019 | Yoon Young-il | Haenam–Wando–Jindo, South Jeolla Province | Democracy and Peace | Independent | Left the Party for Democracy and Peace. |
| 15 November 2019 | Son Kum-ju | Naju–Hwasun, South Jeolla Province | Independent | Democratic | Joined the Democratic Party. |
| 3 January 2020 | Ji Sang-wook | Jung–Seongdong B, Seoul | Bareunmirae | New Conservative | Left the Bareunmirae Party to form the New Conservative Party. |
| 3 January 2020 | Oh Shin-hwan | Gwanak B, Seoul | Bareunmirae | New Conservative | Left the Bareunmirae Party to form the New Conservative Party. |
| 3 January 2020 | Lee Hye-hoon | Seocho A, Seoul | Bareunmirae | New Conservative | Left the Bareunmirae Party to form the New Conservative Party. |
| 3 January 2020 | Ha Tae-keung | Haeundae A, Busan | Bareunmirae | New Conservative | Left the Bareunmirae Party to form the New Conservative Party. |
| 3 January 2020 | Yoo Seong-min | Dong A, Daegu | Bareunmirae | New Conservative | Left the Bareunmirae Party to form the New Conservative Party. |
| 3 January 2020 | Yoo Eui-dong | Pyeongtaek B, Gyeonggi Province | Bareunmirae | New Conservative | Left the Bareunmirae Party to form the New Conservative Party. |
| 3 January 2020 | Choung Byoung-gug | Yeoju–Yangpyeong, Gyeonggi Province | Bareunmirae | New Conservative | Left the Bareunmirae Party to form the New Conservative Party. |
| 3 January 2020 | Chung Woon-chun | Jeonju B, North Jeolla Province | Bareunmirae | New Conservative | Left the Bareunmirae Party to form the New Conservative Party. |
| 12 January 2020 | Chang Byoung-wan | Dong–Nam A, Gwangju | Independent | New Alternative | Formed the New Alternative Party. |
| 12 January 2020 | Chun Jung-bae | Seo B, Gwangju | Independent | New Alternative | Formed the New Alternative Party. |
| 12 January 2020 | Choi Gyeong-hwan | Buk B, Gwangju | Independent | New Alternative | Formed the New Alternative Party. |
| 12 January 2020 | Yu Sung-yup | Jeongeup–Gochang, North Jeolla Province | Independent | New Alternative | Formed the New Alternative Party. |
| 12 January 2020 | Kim Jong-hee | Gimje–Buan, North Jeolla Province | Independent | New Alternative | Formed the New Alternative Party. |
| 12 January 2020 | Park Jie-won | Mokpo, South Jeolla Province | Independent | New Alternative | Formed the New Alternative Party. |
| 12 January 2020 | Yoon Young-il | Haenam–Wando–Jindo, South Jeolla Province | Independent | New Alternative | Formed the New Alternative Party. |
| 19 January 2020 | Lee Un-ju | Gwangmyeong B, Gyeonggi Province | Independent | Onward for Future 4.0 | Formed Onward for Future 4.0. |
| 4 February 2020 | Lee Chan-yeol | Suwon A, Gyeonggi Province | Bareunmirae | Independent | Left the Bareunmirae Party. |
| 5 February 2020 | Kim Sung-shik | Gwanak A, Seoul | Bareunmirae | Independent | Left the Bareunmirae Party. |
| 5 February 2020 | Kim Kwan-young | Gunsan, North Jeolla Province | Bareunmirae | Independent | Left the Bareunmirae Party. |
| 5 February 2020 | Han Sun-kyo | Yongin C, Gyeonggi Province | Liberty Korea | Future Korea | Joined the Future Korea Party, at that time a satellite party of the Liberty Korea Party. |
| 6 February 2020 | Cho Hun-hyun | Proportional representation | Liberty Korea | Future Korea | Joined the Future Korea Party, at that time a satellite party of the Liberty Korea Party. |
| 6 February 2020 | Lee Chan-yeol | Suwon A, Gyeonggi Province | Independent | Liberty Korea | Joined the Liberty Korea Party. |
| 10 February 2020 | Hong Mun-jong | Uijeongbu B, Gyonggi Province | Our Republican | Independent | Removed from the Our Republican Party. |
| 13 February 2020 | Kim Sung-chan | Jinhae, Changwon, South Gyeongsang Province | Liberty Korea | Future Korea | Joined the Future Korea Party, at that time a satellite party of the Liberty Korea Party. |
| 13 February 2020 | Lee Jong-myung | Proportional representation | Liberty Korea | Future Korea | Joined the Future Korea Party, at that time a satellite party of the Liberty Korea Party. |
| 14 February 2020 | Chung Woon-chun | Jeonju B, North Jeolla Province | New Conservative | Future Korea | Left the New Conservative Party to join the Future Korea Party, at that time a satellite party of the Liberty Korea Party. |
| 17 February 2020 | 105 members | – | Liberty Korea | United Future | Liberty Korea Party merged into the United Future Party. |
| 17 February 2020 | 7 members | – | New Conservative | United Future | New Conservative Party merged into the United Future Party. |
| 17 February 2020 | Lee Un-ju | Gwangmyeong B, Gyeonggi Province | Onward for Future 4.0 | United Future | Onward for Future 4.0 merged into the United Future Party. |
| 18 February 2020 | Shin Yong-hyeon | Proportional representation | Bareunmirae | Independent | Removed from the Bareunmirae Party. |
| 18 February 2020 | Lee Sang-don | Proportional representation | Bareunmirae | Independent | Removed from the Bareunmirae Party. |
| 18 February 2020 | Kim Su-min | Proportional representation | Bareunmirae | Independent | Removed from the Bareunmirae Party. |
| 18 February 2020 | Lee Tae-gyu | Proportional representation | Bareunmirae | Independent | Removed from the Bareunmirae Party. |
| 18 February 2020 | Kim Sam-hwa | Proportional representation | Bareunmirae | Independent | Removed from the Bareunmirae Party. |
| 18 February 2020 | Lee Dong-seop | Proportional representation | Bareunmirae | Independent | Removed from the Bareunmirae Party. |
| 18 February 2020 | Lim Jae-hoon | Proportional representation | Bareunmirae | Independent | Removed from the Bareunmirae Party. |
| 18 February 2020 | Kim Jung-ro | Proportional representation | Bareunmirae | United Future | Left the Bareunmirae Party to join the United Future Party. |
| 21 February 2020 | Gwon Eun-hui | Proportional representation | Bareunmirae | Independent | Left the Bareunmirae Party. |
| 21 February 2020 | Lee Dong-seop | Proportional representation | Independent | United Future | Joined the United Future Party. |
| 24 February 2020 | 8 members | – | Bareunmirae | Minsaeng | Bareunmirae Party merged into the Minsaeng Party. |
| 24 February 2020 | 7 members | – | New Alternative | Minsaeng | New Alternative Party merged into the Minsaeng Party. |
| 24 February 2020 | 4 members | – | Democracy and Peace | Minsaeng | Party for Democracy and Peace merged into the Minsaeng Party. |
| 24 February 2020 | Lim Jae-hoon | Proportional representation | Independent | United Future | Joined the United Future Party. |
| 25 February 2020 | Hong Mun-jong | Uijeongbu B, Gyonggi Province | Independent | PNP | Formed the Pro-Park New Party. |
| 27 February 2020 | Gwon Eun-hui | Gwangsan B, Gwangju | Independent | People (2020) | Joined the People Party (2020). |
| 28 February 2020 | Shin Yong-hyeon | Proportional representation | Independent | United Future | Joined the United Future Party. |
| 28 February 2020 | Kim Su-min | Proportional representation | Independent | United Future | Joined the United Future Party. |
| 28 February 2020 | Kim Sam-hwa | Proportional representation | Independent | United Future | Joined the United Future Party. |
| 1 March 2020 | Lee Tae-gyu | Proportional representation | Independent | People (2020) | Joined the People Party (2020). |
| 3 March 2020 | Cho Won-jin | Dalseo C, Daegu | Our Republican | Liberty Republican | Our Republican Party merged into the Liberty Republican Party. |
| 3 March 2020 | Seo Chung-won | Hwaseong A, Gyeonggi Province | Independent | Liberty Republican | Joined the Our Republican Party (2020). |
| 4 March 2020 | Yoon Sang-hyun | Nam B, Incheon | United Future | Independent | Left the United Future Party. |
| 4 March 2020 | Lee Hyun-jae | Hanam, Gyeonggi Province | United Future | Independent | Left the United Future Party. |
| 8 March 2020 | Sohn Hye-won | Mapo B, Seoul | Independent | Open Democratic | Formed the Open Democratic Party. |
| 9 March 2020 | Kim Jong-hee | Gimje–Buan, North Jeolla Province | Minsaeng | Independent | Left the Minsaeng Party. |
| 12 March 2020 | Kim Ki-sun | Wonju A, Gangwon Province | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 13 March 2020 | Kwak Dae-hoon | Dalseo A, Daegu | United Future | Independent | Left the United Future Party. |
| 16 March 2020 | Shin Yong-hyeon | Proportional representation | United Future | Minsaeng | Removal from the Bareunmirae Party invalidated; included in the Minsaeng Party. |
| 16 March 2020 | Kim Su-min | Proportional representation | United Future | Minsaeng | Removal from the Bareunmirae Party invalidated; included in the Minsaeng Party. |
| 16 March 2020 | Kim Sam-hwa | Proportional representation | United Future | Minsaeng | Removal from the Bareunmirae Party invalidated; included in the Minsaeng Party. |
| 16 March 2020 | Kim Jung-ro | Proportional representation | United Future | Minsaeng | Removal from the Bareunmirae Party invalidated; included in the Minsaeng Party. |
| 16 March 2020 | Lee Dong-seop | Proportional representation | United Future | Minsaeng | Removal from the Bareunmirae Party invalidated; included in the Minsaeng Party. |
| 16 March 2020 | Lim Jae-hoon | Proportional representation | United Future | Minsaeng | Removal from the Bareunmirae Party invalidated; included in the Minsaeng Party. |
| 16 March 2020 | Lee Tae-gyu | Proportional representation | People (2020) | Minsaeng | Removal from the Bareunmirae Party invalidated; included in the Minsaeng Party. |
| 16 March 2020 | Lee Sang-don | Proportional representation | Independent | Minsaeng | Removal from the Bareunmirae Party invalidated; included in the Minsaeng Party. |
| 16 March 2020 | Kweon Seong-dong | Gangneung, Gangwon Province | United Future | Independent | Left the United Future Party. |
| 18 March 2020 | Jeong Tae-ok | Buk A, Daegu | United Future | Independent | Left the United Future Party. |
| 19 March 2020 | Jeong Kab-yoon | Jung, Ulsan | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 19 March 2020 | Won Yoo-chul | Pyeongtaek A, Gyeonggi Province | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 19 March 2020 | Yeom Dong-yeol | Taebaek–Hoengseong–Yeongwol–Pyeongchang–Jeongseon, Gangwon Province | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 19 March 2020 | Chang Seok-chun | Gumi B, North Gyeongsang Province | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 19 March 2020 | Min Byung-doo | Dongdaemun B, Seoul | Democratic | Independent | Left the Democratic Party. |
| 23 March 2020 | Lee Eun-jae | Gangnam C, Seoul | United Future | Christian Liberal Unification | Left the United Future Party to join the Christian Liberal Unification Party. |
| 23 March 2020 | 2 members | – | Liberty Republican Party | Our Republican | Liberty Republican Party renamed as the Our Republican Party. |
| 25 March 2020 | Lee Hoon | Geumcheon, Seoul | Democratic | Platform | Joined the Platform Party, a satellite party of the Democratic Party. |
| 25 March 2020 | Lee Jong-kul | Manan, Anyang, Gyeonggi Province | Democratic | Platform | Joined the Platform Party, a satellite party of the Democratic Party. |
| 25 March 2020 | Sim Chang-hyeon | Uiwang–Gwacheon, Gyeonggi Province | Democratic | Platform | Joined the Platform Party, a satellite party of the Democratic Party. |
| 25 March 2020 | Lee Gyu-hee | Cheonan A, South Chungcheong Province | Democratic | Platform | Joined the Platform Party, a satellite party of the Democratic Party. |
| 25 March 2020 | Je Youn-kyung | Proportional representation | Democratic | Platform | Joined the Platform Party, a satellite party of the Democratic Party. |
| 25 March 2020 | Shim Gi-jun | Proportional representation | Democratic | Platform | Joined the Platform Party, a satellite party of the Democratic Party. |
| 25 March 2020 | Jung Eun-hye | Proportional representation | Democratic | Platform | Joined the Platform Party, a satellite party of the Democratic Party. |
| 26 March 2020 | Song Hee-kyung | Proportional representation | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 26 March 2020 | Moon Jin-guk | Proportional representation | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 26 March 2020 | Kim Gyu-hwan | Proportional representation | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 26 March 2020 | Kim Jong-suk | Proportional representation | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 26 March 2020 | Kim Seung-hee | Proportional representation | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 26 March 2020 | Yun Jong-pil | Proportional representation | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 26 March 2020 | Kim Sun-rye | Proportional representation | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 26 March 2020 | Kim Gwang-su | Jeonju A, North Jeolla Province | Minsaeng | Independent | Left the Minsaeng Party. |
| 26 March 2020 | Lee Eun-jae | Gangnam C, Seoul | Christian Liberal Unification | Independent | Removed from the Christian Liberal Unification Party. |
| 27 March 2020 | Yun Il-gyu | Cheonan C, South Chungcheong Province | Democratic | Platform | Joined the Platform Party, a satellite party of the Democratic Party. |
| 27 March 2020 | Lee Eun-jae | Gangnam C, Seoul | Independent | Korea Economic | Joined the Korea Economic Party. |
| 30 March 2020 | Yeo Sang-gyu | Sacheon–Namhae–Hadong, South Gyeongsang Province | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 30 March 2020 | Park Maeng-woo | Nam B, Ulsan | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 30 March 2020 | Baek Seung-joo | Gumi A, North Gyeongsang Province | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. |
| 27 April 2020 | Lee Eun-jae | Gangnam C, Seoul | Korea Economic | Independent | Left the Korea Economic Party |