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Dong Hyeon is a high school student and Pan Soo is a member of a criminal organization. One day, Dong Hyeon falls from the rooftop and falls on top of Pan Soo. Later when the gangster wakes up in the hospital, he finds himself in the body of a teenager.

Abe plays the single Takagi Mamoru, an employee at a stationery maker. He ends up becoming the guardian of his deceased friend's twin children, played by Ashida and actor Suzuki Fuku. The show is primarily a home drama about the three of them gradually becoming a family, but it also contains an element of fantasy, as the two kids find a dog that can speak (played by a male Miniature Schnauzer).

Min Ho, a music producer who is struggling to write a new song because of the lack of inspiration. He is told by his manger that he has to find love so he would have emotions to write a new melody. He then meets a Chinese tourist named Ling Ling. Min Ho is inspired by Ling Ling but due to their language barrier he decides to adds her as a friend on the mobile messenger app LINE to communicate with one another.