Born in Seoul, Kim attended Younghoon High School before majoring in law at Hanyang University.
[1] He was also in charge of defending Yoo Woo-seong, a North Korean defector who was falsely accused as a spy.
[7] Following his confirmation as the Democratic candidate for Namyangju 3rd, Kim faced a challenge against the then MP Joo Kwang-deok, who was seeking re-election under the banner of the United Future Party (UFP).
[9] On 16 April 2021, approximately a year after his election, Kim launched his bid for the party's vice presidency in the by-election on 2 May.
[11][12] The Maeil Business Newspaper said that the outcome was due to strong support from pro-Moon Jae-in members.