# List of My Little Old Boy cast members

My Little Old Boy (a.k.a. Mom's Diary: My Ugly Duckling; Korean: 미운 우리 새끼; RR: Miun Uri Saekki) is a South Korean television entertainment program, distributed and syndicated by SBS every Sunday at 21:05 (KST).

## Regular members

| Name | Mother | Episodes | Notes |
| Lee Sang-min | Im Yeo-soon (Ep 32–63, 69–70) | 32–present | Lee Sang-min is the leader of the cast members of the show. He has a debt of about $6 million and he's very frugal as a result of it. He lives on his memories during his glory days and likes to show off a lot. He is a sneaker collector and takes great interest in shoes. It was said in the show that he keeps around 300 pairs of sneakers in his home. He is also friends with most of the sons on the show. |
| Kim Jong-kook | Cho Hye-seon (Ep 78–287,331–present) | 76–present | He won the Grand Award at the 2020 SBS Entertainment Awards. He loves to exercise and goes to the gym a lot. His testosterone level is 9.24. Similar to both Kim Hee-chul and Hong Jin-young, Kim Jong-kook also enjoys playing video games. Like Lee Sang-min, he is very frugal and is unable to tolerate people wasting anything. |
| Im Won-hee | | 87–present | He is known as "pitiful Won-hee" because of the way he dresses and his red cheeks. He is fond of going to the flea market to buy exotic old toys at high prices, as well as clothing. He has a calm nature and he enjoys things that bring old memories. He won the Best Couple Award at the 2020 SBS Entertainment Awards. |
| Bae Jung-nam [ko] | | 109–231, 406–present | Bae Jung-nam lives alone with his dog named Bell. He takes interest in fashion designing and he hand sews old clothes and creates new designs out of them. He speaks in Busan dialect. He is a fashion model as well as an actor. |
| Kim Hee-chul (Super Junior) | Kim Sun-ja | 153–present | Similar to Hong Jin-young, Kim Hee-chul likes to play video games. He loves watching Chinese martial arts drama series and memorize the dialog of the entire scene. He is extremely neat to the point of avoiding cooking food at his own home. |
| Dindin | Kim Pan-rye | 291-present | |
| Heo Kyung-hwan | Lee Shin-hee | 302-present | |
| Lee Dong-gun | Seo Young-nam | 365-present | |
| Choi Jin-hyuk | Park Mi-jia (Ep 392–present) | 234–265, 293–present | |
| Han Hye-jin | Yoon Ji-young | 367-present | |
| Kim Seung-soo | Choi In-sook (Ep 369–present) | 367-present | |

### Former

| Name | Mother | Episodes | Notes |
| Kim Je-dong | Park Dong-yeon | Pilot–3 | |
| Heo Ji-woong [ko] | Kim Hyun-joo | Pilot–31 | He suffers of mysophobia so he spends most of his time cleaning the house and car. He's a figurine lover, especially the Star Wars ones, Darth Vader being his favorite character. |
| Kim Gun-mo | Lee Sun-mi | Pilot–167 | He is a soju lover, bicycle maniac (he owns 7 bicycles) and has a love for printed T-shirts. He has a game addiction. He also has a large collection of drones. |
| Park Soo-hong | Ji In-sook | 1–237 | He has andropause and is a club frequenter. |
| Hong Jin-young & Hong Sun-young | Choi Mal-soon | 118–217 | Hong Jin-young lives with her older sister Sun-young. Jin-young likes to play video games. |
| Lee Tae-sung & Sung Yu-bin [ko] | Park Young-hye | 184–301 | Lee Tae-sung lives with his younger brother, singer Sung Yu-bin, and is raising his son Han-seung as a divorced single father. Han-seung splits his time between his father and paternal grandparents' homes. |
| Park Goon [ko] | | 226–293 | Park Goon was a former special forces soldier and is currently a trot singer. He has a good personality. He often hangs out with Lee Sang-min. |
| Tony An | Lee Ok-jin (Ep 3–183, 274–present) | 3–77, 274 | Tony is an alcoholic and has a messy image. He often puts off cleaning his house that is designed like a convenience store. |

## Special members

| Name | Episodes | Notes / Ref. |
| Kim Jong-min | 56–57, 273–present | He has a clumsy image and is concerned about his health so he takes a lot of supplements and vitamins. |
| Tak Jae-hoon | 69–present | He is known as the semi-regular cast member of the show. His grumpy and sarcastic jokes are what makes him stand out. He is good friends with Lee Sang-min, Kim Jong-kook and Im Won-hee and often hangs out with them. |
| Jung Suk-yong [ko] | 198–present | Jung Suk-yong is Im Won Hee's close friend. They always spend time and travel together, hence winning the Best Couple Award at the 2020 SBS Entertainment Awards. |
| Kim Jun-ho | 213–present | Kim Jun-ho has been divorced for 7 years. He often drinks and has hangovers but doesn't clean up his mess. He is the Vice Chairman of the club made by the cast members. |
| Choi Si-won (Super Junior) | 269-present | |
| Kim Gun-woo | 341-present | |
| Eun Ji-won | 386-present | |

### Former

| Name | Episodes | Notes / Ref. |
| Yoon Jung-soo | 57 | He is a foodie and tries by any means to lose weight. |
| Yang Se-chan & Yang Se-hyung | 72, 74, 98–100 | |
| Sam Okyere | 73 | |
| Dok2 | 79 | |
| Seungri | 89–90, 92, 94–95, 97 | |
| Jung Jae-hyung | 102–103 | |
| Joo Byung-jin [ko] | 106–107 | |
| Hong Jin-young | 103–104, 113–114 | |
| Jun Jin | 137–138 | |
| Eum Moon-suk | 173–174 | |
| Kim Hyung-muk [ko] | 180 | |
| Jang Minho & Young Tak | 190–193 | |
| Kim Ho-joong | 194–195, 200, 202, 214 | |
| Kim Min-jong | 218-219 | |
| Lee Hee Moon | 235 | |
| Go Eun-ah | 240–243 | |
| Kwak Si-yang | 266–285 | |
| Kim Min-kyung [ko] | 332-338 | |
| Park Sun-young (actress, born 1970) [ko] | 355, 357 | |
| Go Jun | 358 | |
| Woo Sang-hyeok | 368 | |
| Na Sun-uk | 380 | |
| Im Hyun-sik | 382, 387 | |
| Bae Sung-jae | 397-398, 401 | |
| Youn Sung-ho | 399 | |
| No Min-woo | 402 | |