Kang Hoon and Kang Joon have a bad case of sibling rivalry. Yoon Seo has an idea to wash away the anger, until an unexpected visitor stops them cold.

Kang Hoon's mother isn't happy about his feelings for Yoon Seo. Just when the couple seems the closest, a new contract proposal could ruin everything.

A heartfelt proposal might be the end of Kang Hoon and Yoon Seo's relationship. But is a different kind of contract an offer Yoon Seo can't refuse?