<blockquote>Wei Ying hiccupped a bubble of blood out of his mouth, and he shifted on the sword, sending a swift terror through Lan Wangji. He pinned Wei Ying mercilessly close, tightly enough he could support Wei Ying’s entire weight even if his feet left the steel.
Wei Ying had closed his eyes on the cliff at Nightless City and let himself fall back. Lan Wangji’s heart had leapt out through the wall of his chest. Lan Wangji had stopped him, pulled him forward and thrown down a teleportation talisman and swept him away. He would not, could not let him slip through his hands now.
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Wei Wuxian survives, goes into hiding in Cloud Recesses, and Forest Gumps his way through the events of the timeskip, which alters their course.</blockquote>
➤ author tags this "this AU is gentler than canon but isn't a complete fix-it" which...yup. But also the author's inspiration was wanting Jin Rusong to not die!