making room for new regrets

making room for new regrets: a peggy sue fic for The Untamed; the first MDZS/Untamed thread on the Constellation.

In which Lan Wangji peggy sues back to the start of the Lan summer lectures (along with Nie Huaisang, Jiang Cheng, and Wen Ning). He immediately applies himself to saving Wei Ying.