After qualifying for the bar in 1997, Kim started his career at Incheon District Prosecutor's Office in 2000.

[2] After Moon Moo-il was replaced by Yoon Seok-youl, Kim was shunted off to a professor at the Institute of Justice.

[9] Kim requested the party that he wanted to contest for Songpa 1st constituency, rather than as a proportional representation.

[10] He was subsequently confirmed as the UFP candidate for the constituency,[11] after the then incumbent Park In-sook decided to not seek for re-election.

[15] Several sources have suggested possibilities he will form an alliance with Kim Chong-in and Lee Jun-seok.

[1] He attended Suncheon High School, and then studied politics at Seoul National University.

[1][7] He has an acquaintance with the former interim President of the Democratic Party Kim Tae-nyeon, who is a senior graduated from same high school.