The 2018 South Korean by-elections was held in South Korea on 13 June 2018, coinciding with the local elections. 12 seats to the National Assembly of South Korea were contested.
Reasons for by-elections The following Members of National Assembly lost or resigned from their seats: Seoul Nowon C District: Ahn Cheol-soo (People's), due to Ahn's candidacy for the President of South Korea. Seoul Songpa B District: Choi Myung-gil (People's), due to Choi's violation of the Public Official Election Act. Busan Haeundae B District: Bae Duk-kwang (Liberty Korea), due to Bae's resignation from the National Assembly. Incheon Namdong A District: Park Nam-choon (Democratic), due to Park's resignation from the National Assembly, to run 2018 Incheon mayoral election. Gwangju Seo A District: Song Gi-seok (People's), due to Song's violation of the Public Official Election Act and embezzlement. Ulsan Buk District: Yoon Jong-oh (Minjung), due to Yoon's violation of the Public Official Election Act. North Chungcheong Jecheon-Danyang District: Kwon Suk-chang (Liberty Korea), due to Kwok's violation of the Public Official Election Act. South Chungcheong Cheonan A District: Park Chan-woo (Liberty Korea), due to Park's violation of the Public Official Election Act. South Chungcheong Cheonan C District: Yang Seung-cho (Democratic), due to Yang's resignation from the National Assembly, to run 2018 South Chungcheong Province gubernatorial election. South Jeolla Yeongam–Muan–Sinan District: Park Jun-yeong (Democracy and Peace), due to Park's violation of the Public Official Election Act. North Gyeongsang Gimcheon District: Lee Cheol-woo (Liberty Korea), due to Lee's resignation from the National Assembly, to run 2018 North Gyeongsang Province gubernatorial election. South Gyeongsang Gimhae B District: Kim Kyung-soo (Democratic), due to Kim's resignation from the National Assembly, to run 2018 South Gyeongsang Province gubernatorial election.
Results Seat control Seat Previous member Party Elected member Party Seoul Nowon C Ahn Cheol-soo Bareunmirae Kim Sung-hwan Democratic Seoul Songpa B Choi Myung-gil Bareunmirae Choi Jae-sung Democratic Busan Haeundae B Bae Duk-kwang Liberty Korea Yun Jun-ho Democratic Incheon Namdong A Park Nam-choon Democratic Meng Sung-kyu Democratic Gwangju Seo A Song Gi-seok Bareunmirae Song Gap-suk Democratic Ulsan Buk Yoon Jong-oh Minjung Lee Sang-hun Democratic Jecheon-Danyang Kwon Suk-chang Liberty Korea Lee Hu-sam Democratic Cheonan A Park Chan-woo Liberty Korea Lee Gyu-hee Democratic Cheonan C Yang Seung-cho Democratic Yun Il-kyu Democratic Yeongam–Muan–Sinan Park Jun-yeong Democracy and Peace Seo Sam-suk Democratic Gimcheon Lee Cheol-woo Liberty Korea Song Un-suk Liberty Korea Gimhae B Kim Kyung-soo Democratic Kim Jung-ho Democratic
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