He was previously a member of the National Assembly from 2019 until 2020, and also served on the South Gyeongsang Provincial Council.

[1][2] Yeo Yeong-gug was born on 28 January 1965 in Sacheon, South Gyeongsang Province.

He entered the political world, leaving the labor movement, and has since been elected as member of the South Gyeongsang Provincial Council in the 2010 local elections.

After Roh Hoe-chan's death, he ran for the by-election in the Seongsan District, Changwon.

[3] On 25 March 2019, the Democratic Party's candidate Kwon Min-ho withdrew from the by-election as a candidate and declared his support for Yeo Yeong-gug.