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After a car accident, Tae-Min finds himself in the body of Si-Won, who was a victim of bullying at school. No longer a pushover, he starts standing up for himself but then meets Woo-Jin, an old friend from the past. Somehow, Woo-Jin immediately picks up Tae-Min's 'scent' from Si-Won. What happened between these two in the past and how will it affect their future?(Source: Lezhin)Note: Includes 6 extras.