39 years old, veteran criminal investigation policeman, former captain of the criminal investigation detachment, and twin brother of criminal suspect Guan Hongyu.He is serious, thoughtful, calm in character, rigorous in work, and has a strong sense of justice. He has extremely rich criminal investigation experience. He left the police force due to the case of his brother Guan Hongyu. He was invited by Zhou Xun to assist the police force in handling the case as a consultant. He wanted to take the opportunity to investigate.Clear the suspicious case involving Hongyu.Because of his fear of the night, he could only switch identities with his younger brother.