The Mayor (, lit.
 "Special Citizen") is a 2017 South Korean political drama film written and directed by Park In-je.
 It stars Choi Min-sik, Kwak Do-won, Shim Eun-kyung, Moon So-ri, Ra Mi-ran, Ryu Hye-young and Ki Hong Lee.
 The film was released in South Korea on April 26, 2017 and in the US and Canada on April 28.
Reply 1988 () is a South Korean television series starring Lee Hye-ri, Park Bo-gum, Go Kyung-pyo, Ryu Jun-yeol and Lee Dong-hwi.
 Set in the year 1988, it revolves around five friends and their families living in the same neighborhood of Ssangmun-dong, Dobong District, Northern Seoul.
 It aired every Friday and Saturday from November 6, 2015, to January 16, 2016, on tvN at 7:50 (KST) for 20 episodes.
Phoenix (, lit.
 Firebird) is a 2004 drama/romance South Korean television series starring Lee Seo-jin, Lee Eun-ju, Jung Hye-young and Eric Mun.
 It aired on MBC from April 5 to June 29, 2004 on Mondays and Tuesdays at 21:55 for 26 episodes.
90 Days, Time to Love () is a 2006 South Korean television series starring Kang Ji-hwan, Kim Ha-neul, Jung Hye-young and Yoon Hee-seok.
 It aired on MBC from November 15, 2006 to January 4, 2007 on Wednesdays and Thursdays at 21:55 for 16 episodes.
My Heart Twinkle Twinkle () is a 2015 South Korean television series starring Jang Shin-young, Bae Soo-bin, Lee Tae-im, and Nam Bo-ra.
 It aired on SBS from January 17 to April 12, 2015 on Saturdays and Sundays at 22:00 for 26 episodes.
Bad Family () is a South Korean television series starring Kim Myung-min, Nam Sang-mi, Im Hyun-sik, Yeo Woon-kay, Kang Nam-gil, Geum Bo-ra, Kim Heechul and Lee Young-yoo.
 It aired on SBS from March 22 to May 11, 2006 on Wednesdays and Thursdays at 21:55 for 16 episodes.
Dangerous Women () is a 2011 South Korean television series starring Go Eun-mi, Hwang Bo-ra, Kim Jung-hyun, and Yeo Hyun-soo.
 The morning soap opera aired on MBC on Mondays to Fridays at 7:50 a.m. from October 10, 2011 to March 30, 2012 for 124 episodes.
Lawyers ( is a 2005 South Korean television series starring Jung Hye-young, Kim Sang-kyung, Kim Sung-soo and Han Go-eun.
 It aired on MBC from July 4 to August 23, 2005 on Monday and Tuesday at 21:55 for 16 episodes.
Lovers in Bloom () is a 2017 South Korean television series starring Im Soo-hyang, Do Ji-han, Lee Chang-wook, Lee Eun-hyung, and Nam Bo-ra.
 The series airs daily on KBS1 from 8:25 p.m. to 9:00 p.m. (KST) from May 29, 2017.
Ryu Hye-young (born March 28, 1991) is a South Korean actress and model.
 She is best known for her role as Sung Bo-ra in the hit drama series "Reply 1988" (2015-2016).

Question: How many episodes were in the South Korean television series in which Ryu Hye-young played Bo-ra?
Answer: 20