Kim Tae-Joo (Lee Ha-Na) is the eldest of three siblings. She is warm-hearted and tolerant, but she also has a hot temper. She cuts off relationships with people whom she doesn’t like. One day, Kim Tae-Joo meets Lee Sang-Joon (Lim Ju-Hwan) again after may years. They attended the same elementary school. Lee Sang-Joon is a popular actor. He is sensitive, imaginative, and smart. He is also the eldest sibling in his family. Since he was a child, he has been loved by his family deeply. His family was once in debt, but, after Lee Sang-Joon became successful, he paid off their debt and continues to support them financially. During filming for an acting project, Lee Sang-Joon gets injured and goes to the hospital. There he meets his first love Kim Tae-Joo, whom he knew when he was an elementary school student.