A month ago, Dong Hui's older sister was forcibly admitted to a psychiatric hospital for "suspected mental instability." Hoping to uncover the truth, intern Dong Shi sneaks into the psychiatric ward, only to witness a nightmare at the end of a corridor late at night, something no common sense can explain.
Humanoid creatures, monsters covered in tentacles, and people from different eras and worlds appear in the nightmare... Every mystery points to the same place: the dream, or a real place known as the "Dream Spirit World."
As the boundary between reality and dreams begins to blur, and nightmares cease to be mere terrors during sleep and become a gateway to some kind of "bargain," Dong Shi finally realizes that what he and his sister have become entangled in is more than a mental health crisis. It seems to be a parallel world, one that can only be entered through nightmares...
