After being involved in a car accident together, Hajin is asked by Sihyeon to take care of Sihyeon's younger sister after his death. Hajin never expected that to mean he would wake up in the hospital in Sihyeon's body instead of his own. Even worse, Sihyeon was an infamous idol who would do anything for money, had multiple sponsors, and was apparently about to abandon the boy band he was a part of to sign a new contract with a larger agency.