Yoon Ji Min befriends Hwang Jun Ho who lives across the street from her. Jun Ho moves into Ji Min's neighborhood due to a reason he refuses to disclose. As time went by, they two became friends and fell in love. However, an unexpected event pushes them to grow further apart, leaving Ji Min heartbroken. After several years of not seeing each other, the two former lovers meet again. What kind of sparks will be created when they meet the person that used to be their first love and what story is