Qiu Litao

One night, Sam (played by Hui Zhi 'an), the action director of the film, happened to run into street dance youth Liu Lian (played by Wong Ka Lun) and others at the Cultural Square. This ignited Sam's long-dormant passion for street dance, and he made friends with these young people through dance. Sam returned to his former school for troubled teenagers to visit his mentor and met several people who were passionate about street dance

Aqi (played by Aaron Kwok) is back. He is a professional assassin who strikes fear into the hearts of the underworld. When he was a child, Aqi witnessed his father being killed by his subordinate, Brother Fa. However, since his debut at the age of seventeen, Aqi has regarded himself as a weapon of the underworld and has never sought revenge on Brother Fa. This time, Aqi received a mission from a strange employer to kill Fa Ge's new

Ah Qi (Zhang Zhilin is acted the role of) is back, he is a full-time killer who scares the underworld. In his childhood, A Qi saw his father killed by his younger brother Fa, but since his debut at the age of 17, A Qi regards himself as a weapon of the underworld and has never avenged him on Brother Fa. This time, A Qi received a task from a strange employer to kill Fage's Xin.