Young-Joo (Lee Young-Eun) and Yoon-Soo (Ha Seok-Jin) have to spend their summer in Professor Noh's( Choi Jong-Won ) home, doing their part time job. Young-Joo takes care of his books inside and Yoon-Soo takes care of his flower plants outdoors. One day, the cat Deongchi leads them to each other and they discover feelings of love which they never experienced before.