On a rainy night in Shenzhen, a female prostitute named Sze-kam Oi-yee was strangled to death by female wanted criminal Yip Siu-ngan in order to assume her identity. Ngan poses as Yee and passes the customs and successfully arrives in Hong Kong. After reporting the loss of her ID card, she successfully obtains Yee's identity. Yee has a Hong Kong ID because her husband is a Hong Kong resident, who at the time was waiting for his wife's arrival.
Siu-ngan meets a brothel frequenter Chan Kai-ming, a taxi driver who is divorced and left his daughter Yin-yin to be cared by his mother, whom he also rarely interferes with. Ngan chooses Ming as her victim and first runs him over with a car, crippling him, and later sneaks into his house and holds him hostage and asks about him in detail. One night, Ming's mother comes to visit her son and the vicious Ngan kills her so she will not ruin her plan, and defrauds Yin.
On the day that Ngan receives her ID card, Yee's husband finds Ngan suspicious and follows her to Ming's house. While he fights with Ngan, her husband, Kwan Fai, arrives and kills him. The couple are both wanted criminals. Fai, who is crippled in both hands, intends to take Ming's identity and his arms. Fai chops off Ming's arms, causing him to die from blood loss, and Fai attaches Ming's arms to himself and successfully obtains Ming's identity.
Just as their plan seems successful, Yin escapes from the two and is found by construction workers. The truth is revealed, and Ngan and Fai are once again wanted by the Hong Kong police. Setting foot on the road to escape again, Ngan quotes to Fai, "blame the moment that I was softhearted, I was not cruel enough before, but it does not matter, I will do better next time."
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