Ten years ago, Kyung Woo Yeon was an innocent 18-year-old with dreams of love. She confessed her feelings to her friend, Lee Soo, but was rejected. Seven years later, her second attempt also ends in rejection, leaving her determined to move on. After a lonely day in Jeju, she vows to no longer love him.
With nearly 12 ex-boyfriends, Woo Yeon seeks answers and meets Joon Soo, who offers to help her figure out whether the issue lies with her or the men she dates. Meanwhile, Lee Soo, still haunted by his parents’ divorce, avoids love to prevent further pain. After three years away from Jeju, he returns and finds Woo Yeon with another man, ready to confront his feelings and face his past.