Wooyoung is San's trainer and coach, helping him behind the scenes while he goes out fighting to make money for the both of them. They are best friends, wooyoung being the more flirty one of the two. He's sleazy and mischievous, seeming like the typical bad influence—smoking cigarettes doesn't help his image either. He's nosy and has street smarts, having a sly, fox-like personality that matches his looks. Although he looks like a bad guy, he's quite the gentleman, always putting women first.