What's the title of this movie?

I recently watched an asian thriller movie (I assumed it is korean). It began with a couple finding of a mutilated naked woman near a lake. Investigators, guided by a forensic professor, found the suspect. However, the professor later denied his own findings after he learned that his daughter was kidnapped by the culprit's brother. In the ending, it was discovered that the mutilated woman was the professor's daughter.

I was impressed by the plot (and acting) so I want to know more about this movie. But I don't know its title since it was written in japanese-like letter. Can somebody tell me?

Thanks so much.