Kang-do is a heartless man who has no living family members and whose job is to threaten debtors to repay his clients, the loan sharks who demand a 10x return on a one-month loan. To recover the interest, the debtors would sign an insurance for handicap, and Kang-do would injure the debtors brutally to file the claim. One day he receives a visit from a strange, middle-aged woman claiming she is his long-lost mother. Over the following weeks, the woman stubbornly follows him and he continues to do his job. But he is slowly moved and changed by the motherly love expressed from this woman.