Synopsis：During a boxing tournament, Cheng Zhijiang orders Zhang Haozheng to throw a fight but fails, and in a fit of rage accidentally kills Shunzi, who was berating him. After being released from prison, Zhang Haozheng, who unexpectedly wins the championship, receives an invitation to fight in underground matches. He reports it to the police and goes undercover as an informant deep into the tiger’s den. As the investigation continues, he discovers that Cheng Zhijiang is no longer the brother he once was, and that Sixie harbors a huge secret...