Nie Huaisang enters the room, stating that he was merely nearby, which Wei Wuxian finds suspicious, as he and Lan Wangji found his folding fan near the castle. Wei Wuxian begins to interrogate him about the castle. On the way there, Nie Huaisang explains that the human-eating castle is in fact his sect's burial grounds. Its reputation for "eating people" is a fabricated rumor to discourage people to enter, and ruckuses are caused by the swords left behind by the deceased Nie Sect ancestors...