Toil gets pregnant while dating her tutoring student. She keeps the pregnancy a secret for 5 months, then tells both of her parents. Her step-father, Taehyo is deeply disappointed in her and their relationship gets worse. In the end, Toil decides to leave to track down her biological father. Unexpectedly, the journey to find him brings back memories of both fathers, and it helps her understand why her mother decided to divorce him. Just when she is about to give up on looking, she finds a clue to where her biological father is.
After she tracks him down, he follows her back to Seoul. In her absence, the father of Toil's baby has disappeared. When the two fathers meet, they end up embarking on a quest to find him.