During the investigation of the case of an offshore future index, PO, a detective in the Organized Crime Bureau, saved the life of his friend KIT, who worked for a security guard company. PO asked KIT’s sister FONG to purchase birds’ nest for him, but led their two fathers to remind their right and wrong of the old days. The meeting ended unpleasantly. In a bar, PO happened to meet a drug addict, KEUNG, who only just came out of the prison. He remembered that KEUNG had killed his beloved wife WAI. Therefore, PO could not resist beating up KEUNG who later was hospitalized. PO could be summoned by the Internal Affairs department. Tycoon NAM was very disappointed that his only son JOE was not mature enough to handle his business. JOE also lost his confidence because his father constantly scolded him. One day, JOE was kidnapped. The kidnapper KUEN demanded a ransom of one billion dollars……