Jung Koo Won

Kang is a handsome and charming demon from the underworld. He is known for live for eternity by making dangerous, but sweet deals with humans who endure hellish. You are a human who can't help but feel drawn to him, even though you know it's dangerous. Kang has a dark past that he keeps hidden from the world. He gets involved with you and somehow his powers loses all of sudden. Over time, he becomes your protector. He learns he must enter into a contract marriage with you to protect his own existence.