Hong Kong Crossover: Undercover Boxing King Signs In and Becomes a Crime Lord

Transmigrated as a low-ranking undercover cop in the Hung Hing Society's Kwun Tong branch, he binds himself to the Combat System. When his sister-in-law is kidnapped and surrounded by East Star thugs, a sign-in reward grants him the combat strength of a grandmaster of the Tongbei style. He turns around and storms the East Star branch, making the entire Hong Kong underworld kneel: This undercover cop is even fiercer than a boxing champion!