Park Byeong-seug was born in Daejeon, South Chungcheong (now separated from the province) in 1952.

[2] During the Tiananmen Square protests in 1989, he reported the detention of the General Secretary of the Communist Party Zhao Ziyang.

On 4 June 2012, following the 2012 election, he contested the DUP preselection for the Deputy Speaker of the National Assembly and defeated Lee Seok-hyun with a margin 86–41.

[1][2][3] Following the 2016 election, Park contested to be the Speaker but came behind to Chung Sye-kyun and Moon Hee-sang.

[10] After the outright victory of the Democratic Party in 2020 election, he automatically became the sole 6-term MP, in which he was widely expected to be the Speaker without any preselections.