[2] During the late period of the Imperial Japanese rule in Korea, he became the leader of the Youth Action Corps, a street gang in the Jongno area and gained influence.

[2] Despite his tumultuous youth, he took pride in being the son of General Kim Jwa-jin and engaged in activities such as blowing up Japanese armories and protecting Korean merchants, earning a reputation as a "chivalrous outlaw."

He served as Inspector General of the Korean Youth Corps, led by figures such as Syngman Rhee (이승만), Kim Gu (김구), and Shin Ik-hee (신익희).

In 1948, Kim Du-han was sentenced to death by an American military tribunal for the murder of Jeong Jin-ryong, a leading member of the Communist Party of Korea.

Shortly after joining the 6th National Assembly, Kim was imprisoned at Seodaemun Prison in connection with the "Han-guk Independence Party Conspiracy Case."