Jeon Jungkook is a man of shadows, a ruthless mafia king who rules with ice in his veins. But when his sister Yuna brings her best friend, the fragile and innocent YN, into their mansion, his cold world begins to thaw. As YN battles her past traumas, she unknowingly captures the heart of a predator. In a world of hidden enemies and dangerous secrets, can a king protect his greatest weakness without destroying her?