港岛雪夜，街头无差别扫射，血流成河；医院爆炸火光冲天，惨叫此起彼伏。 这不是末日，是毒品操控下的城市炼狱。 毒贩以毒品掌控城市命脉，杀手为争夺货源血洗街头，警方在阴谋中艰难前行——当三方势力陷入混战，最令人窒息的逆转突然降临：操纵一切的毒贩，竟开始全面禁毒？雪夜之下，谁是幕后推手？谁能从这场罪恶风暴中全身而退？

A serial murderer has brutally killed several policemen and their pregnant wives. After a quick investigation, the murderer is revealed to be Kit, whom the case's detective-in-charge knows from a previous case. Once upon a time, Kit was an innocent boy in a rural village who also has a crush on naïve high school student Wing. After the death of Wing's grandmother, Kit rescues Wing from a foster care facility, and the two quickly fall in love. However, their romance ends prematurely when a local policeman arrests them. The events that follow lay the seeds for Kit's terrifying path to vengeance.