Young-Goo (Lee Pil-Mo) is a troubleshooter for the private loan business world. He does not like his name Young-Goo, so he introduces himself as K. Young-Goo owes money to the ruthless loan shark Madame Park (Hwang Young-Hee). Madame Park hires Young-Goo to find a weakness of Na-Young (Song Ha-Yoon), but Na-Young soon believes Young-Goo is her guardian angel.