Song Yeo Wool and Park Chanyeol have a unique relationship. Ever since elementary school, they despise each other. It all started when Chanyeol ate Yeo Wool's cookie. Ever since then, all they ever did as quarrel. Then in middle school when these learned to curse was the worse. Everyday, these two would be a regular guest at detention. The principal even had a special time slot for them. But they had the strongest bond. Now, they agree to MARRY each other? Will a divorce happen or will they just live with a mutual feeling?