Dui (Eason Chan) is a maverick at fixing things. Taken in by a triad boss (Eric Tsang), he is assigned to find and kidnap the child of the hitman who tried to bump off their leader. In this revenge mission, he is disguised as a school janitor. He befriends a teacher, Miss Cheung (Gia Lin), who is more than meets the eye. Meanwhile Lam Chi Wang (Wen Jun Hui), whose father (George Lam) has left the family and whose mother had committed suicide, has taken a vow of silence. Dui takes it upon himself to care for Chi Wang, and is faced with the dilemma of repaying a benefactor and going for a new relationship.