There's got to be a way to bring back Wen Ning's consciousness, Wei Wuxian knows, and if he can't do it himself, then maybe Lan Wangji can help. Unfortunately for Lan Wangji and his suffering heart, he would do nearly anything for Wei Wuxian. Wen Ning did not get a say, because that's the root of the whole problem.
Lan Wangji will never tell Wei Wuxian what he did after the massacre at Nightless City—what his brother would call the only mistake he ever made. Nor will he forget it himself.