Shin Hyeon-Woo, a young man who moved into the perfect apartment 'Terrarium', was living a very satisfying life. Until the man who jumped from the rooftop yesterday jumped again at the exact same time today. And all the other residents are repeating the same behavior as yesterday... Is this place repeating a day infinitely? Or is everyone acting out the same day on purpose? ... If so, why? Whatever the truth, he has to get out of this crazy apartment complex.