A teenage girl falls in love with a gang leader and is forced into prostitution by him. Amy, Michelle and Yin are three bored teen girls run out of money and decide to trick a guy into paying for their dinner. Their behavior gets them the attention of a gang leader, Danny takes the eldest girl, Amy, as his girlfriend, but as he is indebted to bigger people, he makes her into a hooker. Yin is also drawn into this gang and becomes the girlfriend of Liang, one of Danny's henchmen, and she too becomes a hooker. When Michelle tries to get them out, she is targeted for revenge.
I like the part where Danny asks his girlfriend Amy to be a prostitute for the first time at 52:00. After failing to convince Danny to not turn her into a hooker (50:00), Amy goes to the room of the client and undresses in front of him with confidence and no hesitation. Like she's acting cool about it since she's doing it for her boyfriend, anyway. She lays down on the bed with an attitude like, "Okay, let's get this over with it." However, when the client starts fucking her, a hint of disgust does show on her face and an expression that makes her look like she's questioning the life decisions she made that led to this. Nevertheless, even with those expressions, she looks like she enjoys the sex quite a bit and moans accordingly. After the client is done, she pushes him off her with an attitude that says, "Alright, I'm done here. Get the fuck off me, you disgusting old man." Then she gets up and walks away.
And as stated in the movie description, Yin, who becomes the girlfriend of Danny's henchman Liang, is also turned into a hooker. She gets banged hard by a client at 58:00 and 59:40, with the hard part being in the second scene.