Mid 30's Hyeon-su Nam (Cha Tae-Hyun) is a popular radio d.j. and entertainer (who was even more popular in his younger days as a teen idol). One day his apartment doorbell rings and a young lady named Jeong-nam Hwang (Bo-yeong Park) appears and tells Hyeon-su that he is her father. Furthermore, she informs him that he is now a grandfather to her young son, Ki-dong. Hyeon-su would like nothing better than just close the door, but when Jeong-nam threatens to go to the media he allows the young lady and her son to stay in his apartment. Complications arise when they are spotted outside together and people assume they are romantically involved!