Physical therapist Kim Dan has been down on his luck for as long as he can remember. Between an ailing grandmother, menacing loansharks, and an old boss making it almost impossible for him to find work, Dan is truly running out of options. Naturally, it feels like a dream come true when he’s finally hired to treat top-paid MMA fighter Joo Jaekyung, especially when the man then calls him out for a treatment the night before a match with an oh-so-tantalizing offer of five thousand dollars.