Original Sin.

While growing up, Chi Zhen (Ronald Zhai) learns all the necessary skills and tricks to survive in a harsh world. He becomes an unscrupulous lawyer, but is caught by the police for a crime and sent to jail. Lu Li (Andrew Yin), on the other hand, is the top student of the police academy. When he starts working as a police officer, he manages to solve several big cases in a few years time only and is thus appointed as the chief of his police station. Four years later, the released Chi Zhen is on his way to become a successful businessman while Lu Li is trying to find hints in a mysterious case. Fate brings Chi Zhen and Lu Li eventually together, and while they start out as opponents, they later become partners and friends who even put their lives in each other’s hands.