Who is Detective Yu Guangming from Death of a Red Heroine and what is their importance?

Detective Yu Guangming is a career police officer and family man. He is not ambitious, wanting only to make his father proud by rising above his father's achievements in the police force and to provide for his family. He harbors some initial resentment towards his boss, Chief Inspector Chen, because Chen has been promoted rapidly for political reasons, and Yu does not view him as worthy of his position. He views Chen's poetic nature as a weakness. Through the course of the case, Yu develops a friendship with Chen. They work well as a team and Yu learns that Chen's idiosyncrasies can be a strength.