Kim Chaewon is the most wanted girl in their town. Boys and Girls wanted her attention and her love. Unable to find the right one, With the help of Yena, Chaewon made a interesting challenge to her admirers. The first one to open the treasure chest in her backyard will get a chance to date her. Seems easy? Nope. They have get the key from her cat, Mrs. Ssamachi aka the Grumpiest and Ninja cat ever.    Who will tame Mrs. Ssamchi and get the key to Chaewon's heart?