He is a detective who is obsessed with the truth, walking through bloody murders.
Some people are in the name of evil, some are sinking in sin, and some are looking for salvation in desperate situations.
He uses the law as his ruler and his conscience as his lamp. He pursues evildoers without stopping and is willing to give those who have lost their way a way home.
This is a battle about crime and punishment, and also a criminal's final self-redemption at the end of darkness.