Confession of Pain (2006)

In a city of love and prosperity, a city of lost hope and premature death, veteran detective Hei feels it all: the hurt, the helplessness, the horror. When his father-in-law, the billionaire benefactor Chau, is gruesomely murdered in his palatial mansion, he enlists the assistance of his former partner turned private detective, Bong.

Official website: http://www.confessionofpain.com/