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Former teen idol Nam Hyeon-soo (Cha Tae-hyun) is now in his thirties and working as a radio DJ. One day a young woman named Jeong-nam (Park Bo-yeong) shows up and claims to be his own daughter. Jeong-nam also has a son named Ki-dong (Hwang Seok-hyeon) who she claims to be Hyeon-soo's grandson. As the story progresses their relation is proven via DNA tests by Hyeon-soo's brother. Later this leads to Hyeon-soo attempting to avoid a scandal concerning him having children "unknown" to the media.