Beneath the bright city lights lies a bloodied arena filled with frantic screams and roars. Strong men fight in boxing matches for money, while their audience desperately hopes that their chosen fighters will bring them fortune. For the young rising star Mignon, there is only one place that serves as an escape from the chaos of the ring and his harsh life. The mysterious underground doctor Oh Young-One provides services to injured fighters, and the wide-eyed Mignon finds comfort in his quiet infirmary. Young-One is gentle and caring, always tending to Mignon's wounds, which mainly come from the cruel world outside the boxing ring. However, the doctor hides a taboo secret about himself. In a rare moment of carelessness, he reveals it to Mignon, putting his life in immediate danger. Even though Young-One warns Mignon to keep his distance to protect him, Mignon remains stubborn and refuses to abandon the one person who makes him feel as though he truly matters.