At 11:20 p.m. on September 12, all four residents of Dormitory Room 407 died a gruesome death on a rainy night. Not one of them survived until dawn! Lin Jianying returns after being reborn with memories of her death, back to twenty minutes before the tragedy. Knowing what fate has in store, she frantically blocks the door to keep danger out, desperately stopping her roommates from opening it, only to be misunderstood as crazy and unreasonable. An unexpected late-night dorm inspection, an unanswered phone in the duty room, and a mysterious figure in a raincoat—the countdown has begun. Can they break free from their shared fate of death?