[4] In June 2021, the PPP voted to select Lee Jun-seok as its leader, making him the youngest person in South Korean history to lead the main conservative bloc.

His father, Su-Wol Lee, was the previous head of the global institutional sales team at Shinhan Bank, while mother, Hyang-Ja Kim, was a teacher at Andong Girls' High School.

[14][15] During his time at Seoul Science High School, Lee Jun-Seok served as the vice president of the student council.

While on duty, Lee established a non-profit organization called Edushare 'Society of Sharing Education' and became its acting representative.

[18] Lee had an interview with Park Geun-hye, the head of Grand National Party's emergency response committee, who visited 'Edushare' in November 2011 for 2 hours.

Then, Lee ran for the National Assembly election in 2016 in Sanggye-dong against Ahn Cheol-soo (the running candidate for Presidential primary) but lost.

Before the 21st election of members of the National Assembly, Lee was appointed as a youth supreme representative in Future Unification Party.

He became popular in the 20s and 30s due to his opposing stance against political correctness such as "faux feminism," introducing reforms supporting meritocracy rather than outright equality of outcome.

[26] As a result, Lee was elected as the leader of the PPP, the youngest to represent the main conservative bloc in Korean political history.

[30] On 22 April 2022, the PPP opened an ethics violation complaint against Lee Jun-seok for an allegation of sexual favours in 2013.

Lee is the first chairman in the history of the country's main conservative party to be referred to the ethics committee for review while still in office.

The subject of the committee's deliberation was the alleged attempts of Lee and Kim Cheol-keun, the head of the party's political affairs office, to destroy evidence.

Kim Cheol-keun was handed a two-year suspension from party activities for destroying evidence of Lee Jun-seok's acceptance of sexual favors and bribery.

[36][37] South Korean liberal newspaper Hankyoreh also compared Lee Joon-seok to Donald Trump, analyzing that there may be many differences in the political direction of the two, but the background of their dissatisfaction with the established system is similar.