[1] After September 1945, he served as a representative of a Kantō district association of Koreans and a member of the preparatory committee for Chongryon, which was founded in October 1945 and formed on May 25, 1955.

[1] In December 1949, after Chōren was ordered to be disbanded by the Japanese government, Han was appointed as the head of the National Countermeasures Department of the Japanese Communist Party, and in 1951, he opened the Nine Wolseobang (九月書房) to sell publications donated by the propaganda department of North Korea's Workers' Party of Korea and use the proceeds to develop the Korean Zainichi movement.

Additionally, he was appointed dean of Korea University in 1968, and although there was an uproar around 1970 when Vice-Chairman Kim Pyong-sik openly rebelled against him, he managed to resolve it and held the position of chairman of Chongryon until his death in 2001.

[2] He was elected as a central committee member at the founding convention of the Democratic Front for Fatherland Unification held in Pyongyang in June 1949 and has consistently maintained a pro-North Korean stance ever since.

Meanwhile, Han and his family were living a life of luxury, occupying a massive mansion in a neighborhood in Tokyo that was staffed with domestic workers, bodyguards, personal assistants, academic tutors for the children, chefs, and chauffeurs.