The Law of Talion

Hayeon loses her only sibling to an unknown man. In a desperate situation where even the police have found no clues, Hayeon, in danger, is coincidentally rescued by Yoosung, a mysterious man with heterochromia (blue eyes). Yoosung warns Hayeon to stop seeking revenge, acting as if he knows the culprit's identity. Feeling both hope in his cold words that she can catch the killer and anger at his reckless attitude, Hayeon eventually follows him to his room. There, she is confronted with the countless scars covering Yoosung's body. What truth is he hiding, the only hope for finding the killer and taking revenge? "Is it hard for you to see someone die because of you? If you don't help me, I'll die right in front of your eyes."