Lo Lik, a medicine smuggler active in Thailand and Cambodia, returns to Hong Kong to kill playboy Da Siu to avenge his niece. While in hiding from Wen's angry godfather, underworld leader Shen Lo-Sam, Lo is forcibly brought before a rich merchant's daughter Ho Ying. She offers him protection and huge money to slip back into Cambodia to eliminate Thailand's No. 1 killer Naiman and retrieve a secret commercial tape from him, claiming that he killed her father for it. La gathers four old mercenary colleagues Yun Namsing, Curry, Lei Tai and Brand, along with a burglar named Hung Fan, and they set themselves up in Ho Ying's Thai villa. There Lo rescues Ho Ying from the attentions of a brutal killer and becomes infatuated with her. Once in Cambodia, the group kill several attacking guerillas before reaching Naiman's hideout, where, posing as medicine smugglers, they offer to sell their supplies to Naiman's sworn brother, guerilla leader Yingdan. They carry out a daring night raid and barely escape with Naiman as hostage. Hung Fan is killed trying to snatch a getaway truck, and the remaining five hand Naiman over to Ho Ying. Only now do the friends discover that they have been tricked. In peril of their lives they return to Hong Kong and embark on a savage attempt to get even with their scheming employer.

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