Lee Sungyoon is a 34 years old single divorcee. Now in his third year of divorce, the people around him are telling him to date again. One day, Sungyoon runs into famous author, Seo Hyunsoo, by chance at a bookstore. When Sungyoon and Hyunsoo were in high school, they had a close senior-junior relationship, but then Hyunsoo one-sidedly cut off all contact with Sungyoon!