On the day of his grandfather's funeral, his grandson Kin-Heon commits an irreversible relationship with his grandfather's hundreds of sponsors. Among them is Baek-Yeon, who grew up with his grandfather's support. One phone call, he gets caught up with Kin-Heon again, after forgetting him for 4 years. More than a hundred people who have had a relationship with him in the past claim to have his son. Ki-Heon, who does not believe that they have given birth to his son, decides to go down to his hometown because of the doubt of the existence of a child.+