2018 South Korean by-elections
# 2018 South Korean by-elections

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 |
