It turns out that the real murderer was Fang, and that's why she's being punished for her crimes. It's not that she didn't commit the crime, it's just that she couldn't bear the thought of being blamed for something that she wasn't responsible for. She's done, she says, and she'll pay her family a lot of money for it. Fang is caught on the surveillance camera, and it shows that he's in the window, under the car, and behind the fence. He's also caught in the trunk, which means that she must have carried all the weight of the body into the car.