Ho-yung is a high school senior who has the utmost zeal and engery for everything she does, except studying. She gets dumped by her boyfriend on their 100 day anniversary. When she on her way home, she lets out of frustration on an empty can of coke by kidding a long nice kick. The flying can hit one guy name Hyung-joon on his head while driving his car (Lexus 430). He crashes his car onto the wall. Furious Hyung-joon demands that Ha-young to pay for his damage car. When he shows up at her school, she agrees to pay for the damage by being his salve for 100 days. she has no choice just to agree, so she sign up a contact of Enslavement Agreement. Then her nightmare of slavery begins.......