Jeonghan's boyfriend dumps him and out of spite, he hurls his anniversary gift that accidently dents Seungcheol's car. Being a broke college student without a single dime, he is forced to spend 25 days with him to pay off his debts. However, what will happen during those 25 days? A lot can happen, and Jeonghan had no idea that his time with Mr. Arrogant would turn into something more.