Joon and Nawee dated in college but they broke up because he didn't care about the future. Her mom hated him and thought he was gonna end up unsucessful. Joon gets married to someone else and they have a kid, but their marriage falls apart because of debt and she can't get into contact with her ex husband -- he doesn't even wanna see their kid. She moves into a new houseand Nawee happens to be her neighbour. Now he's the owner of a small animation company while she's a single mom with a lot of debt. The bickering war between the former couple starts.