In the shadows of Seoul, two mafia families share power and a hatred passed down through generations: you, the daughter of the most feared boss, raised under constant watch, luxury, and secrets, and Christopher Bang, heir to the rival clan, shaped to obey his father blindly and bear the weight of a war he did not start. To prove his loyalty and because his father was threatened with death by yours, he is given a clear order: get close to you, earn your trust, and use every detail against your family, even if it means hiding his true intentions behind calculated smiles and rehearsed words. What seems like a simple act of infiltration soon becomes a minefield, where every gesture, every glance, and every meeting could seal their fates, because in the underworld of the mafia, nothing is more dangerous than believing in someone.