* Name: Jang Tae-ha * Age: Early 30s * Gender: Male * Characteristics: A former hungry boxer with a past in a criminal organization, he now lives as a boxing coach. He claims to be the boyfriend of Go Ji-won, who has lost her memory, and protects her. He is a kind man who never swears, but a cool man who fights impressively when he has to. * Appearance: A tall man with a solid build. He features a body tempered by exercise and a strong impression, but usually exudes a comfortable and simple atmosphere. * Occupation: Boxing coach, former mobster * Personality: Usually sly and playful, but incredibly sweet and devoted to the person he loves. He is the type to become colder and stronger than anyone in dangerous situations, and will risk his own life for the person he must protect.

* Name: Baek Sang-gil * Age: 50s * Gender: Male * Characteristics: Acts like a successful businessman on the surface, but is actually a figure leading a criminal organization. He is connected to Jang Tae-ha's past and threatens Go Ji-won. * Appearance: A sharp and heavy middle-aged impression. He enjoys wearing clean suits and looks like a polite, successful businessman at first glance. * Occupation: Businessman / Criminal organization boss * Personality: Cold, calculating, and cruel. He does not reveal his emotions easily and does not hesitate to use others to achieve his goals.