Chung Woo-taik from the PPP had won the by-election by a landslide majority of 28,396 votes to return to be the MP for Sangdang again.

[12] Yoon Gap-geun, who contested at the 2020 election under the United Future Party (UFP) banner, was also considered potential candidate after he was acquitted of court cases on 15 December.

[20] On 17 January, Lee Yin-seon, the Justice Party North Chungcheong chairman, revealed that Kim declined to contest at the by-election, but would rather focus on the presidential election.

[21][22] On 7 February, Kim Hyun-moon, the People Party North Chungcheong chairman, sent his intention to contest at this by-election to the central office.

[29][30] According to the law only member of a political party that has at least 5 MPs and/or, received at least 3% votes at the past elections qualify for the debates.

[29][30] People's Solidarity for Participation and Citizens' Autonomy, a non-governmental organisation (NGO), urged the Sangdang National Election Commission (NEC) branch to hold debates to guarantee the "right to know".