Start / Danmei / BL / System / Endlosschleife / Death Kaleidoscope

His cat stopped letting him hold it. Then his apartment hallway became a corridor with doors that lead to the dead.

Door-based infinite-flow at its most airtight: Lin Qiushi is pulled into a mansion of twelve doors, each a haunted scenario with rules that can only be learned by watching others die. Its CP became one of the fandom's favorite cold-burn ships.