Gangster boss A-Kuan (played by Tony Leung Ka Fai) has a good career, but his family is in a mess: his son Sid (played by Jaycee Chan) is a rock rebellious youth who wants to inherit his father's business; his daughter Sina (played by Josie Ho) is a pet doctor and is in love with her colleague Michael, which is incompatible with her father's life. Sid had to flee to a remote mountainous area in Taiwan to seek refuge because he stole Carmen (played by Zheng Xiyi), the woman of another gang boss, Lao Ma (played by Kenneth Tsang). With him was A-Kuan's right-hand man, A-Zhao (played by Cheung Yaoyang). In Taiwan, Sid joined Zen Drum Mountain People and changed his name to A Dao. He met the girl Hong Dou (played by Angelica Lee) in the drum team and found peace of mind in the simple life of the drum team; A-Zhao also attended classes in the community school and found the purpose of life. In Hong Kong, because of Sid's escape, A-Kuan's business was affected, but he also reconciled with his daughter Sina and accepted her life and feelings. At the same time, Zen Drum Mountain People's world tour began, and the first stop was Hong Kong. When Sid and his father Guan gradually get to know each other and begin to put aside their past grievances, Guan is assassinated in prison. Sid's simple life is disrupted, the business of the society and the grievances with Lao Ma come one after another. How does he face all this?