내 귀가 되어줘

The man receives a text message from his ex-girlfriend, Seung-yoon, and heads to the motel. At the motel, the man finds the baby that Seung-yoon left behind. He thinks he is his son and gives the baby the name 'Lee Jun' and raises him. While raising the baby, co-workers say they saw the child's mother in the neighborhood and ask him to visit her. The man visits the woman with the baby 'Lee Jun'.