Ha-yeon has lost her sole younger sibling to an unknown assailant. In a dire situation where the police have failed to uncover any leads, she finds herself in peril and is unexpectedly rescued by a mysterious individual named Yu-seong, who possesses one blue eye that looks different from the other. Yu-seong cautions Ha-yeon against pursuing revenge, as though he is aware of the identity of the perpetrator. Amid his icy remarks, Ha-yeon detects a glimmer of hope that she might be able to apprehend the criminal, yet she is also infuriated by his nonchalant demeanor. Ultimately, she follows Yu-seong back to his room. There, she discovers numerous scars adorning Yu-seong's body. What secret is he concealing—the only chance she has to locate the offender and seek vengeance? "Does it hurt when someone dies because of you? If you refuse to assist me, I will perish right here in front of you."