Han Jisung's father was a feared yakuza boss in Japan. He wanted to expand his business empire to Korea, and Jisung was sent to Korea as a spy to gather information about the Korean Yakuza community.

Jisung soon became a high-ranking member of the Korean yakuza, and he used his connections to help his father's business. He became a feared and respected figure in the Korean underworld, and he was a valuable asset to his family's yakuza organization.