To fulfill his dream as a great computer game designer, Chung refused to inherit his father's antique business. Chung, along with his younger half brother, Chi, work for a Japanese game company. To enter an internal design contest, Chung created a storyboard and programmed parts of a computer game (幻夢之城). The game involves a girl named Jora being chased by an evil sorceress, Salomi, while another character called Siu Lo Tau is supposed to give Jora directions to defeat Salomi. One stormy night, lightning strikes Chung's computer and Jora and Siu Lo Tau run out of the game and enter the real world. Unaware of Jora's true identity, Chung mistakes her for an illegal immigrant from mainland China.