Three years ago. Fan (Lau Ching Wan) suffered a schizophrenic breakdown, killed his wife (Michelle Ye), and unsuccessfully attempted to kill himself. He was arrested and sentenced to rehabilitation in a psychiatric facility indefinitely. Chow (Huang Xiaoming) is Fan's psychiatrist. He believes that after years of treatment and against all odds, Fan has recovered. He is determined to see Fan discharged. However when Fan is released back into society, he suffers discrimination and once again finds himself at the brink of collapse. One night, Fan kills a drug addict, and turns to his only friend Dr Chow for help. Chow fears if the event is uncovered, his career will be destroyed. He decides to help Fan and conceal the truth, while at the same time being tormented by the media and public opinion. But Fan's clinging to Chow only makes things worse. In order to undo his mistakes, Chow decides to heal Fan secretly. However, in the course of the treatment, can Chow make his way out of this bottomless psyche whirlpool?