After being dumped by her boyfriend just before their 100 day anniversary, Ha-Young (Ha Ji-Won) meets a college guy named Hyung-Joon when she accidentally kicks a can that hits him in the face and causes him to scratch his Lexus. He demands she pay him $3000 on the spot. She escapes from him, leaving her wallet behind. Hyung-Joon stalks her, demanding money to pay for his car. She becomes his slave for 100 days. When she finds out the debt only costs a few $ she wants revenge.
