One night at a club, Hara encounters a stunning girl and they end up going back to her place. Following a romantic encounter, Go-Eun awakens the next day to find Hara beside her in bed. Due to having no memory of sleeping with Hara, she is taken aback and demands that she leave. This confuses Hara, as she believes she spent the night with the same person she met at the club. Thus begins a tale of Hara, Go-Eun, and a duplicated Go-Eun.