Kim Dan is a diligent worker who is grateful for any open job given to him having lost one as a physical therapist. Requiring money to pay off a debt passed onto him by loan sharks, in addition to his grandmothers' hospital bills, Dan accepts any job that was available to him. He immediately accepted a job offer to be Joo Jaekyung's personal physical therapist. Unaware that previous doctor's had fled due to Jaekyung's temperament, he enters the building where Jaekyung was currently sparring with one of his colleagues. Ever professional in his duties, Dan nevertheless has troubled thoughts due to his predicaments.