In this Au:
Wei wuxian fall off the cliff, this happen at the nevernight
when Lan wangji try to save him but failed. Wei ying death
cause Lan wangji a lot of pain, depression and almost want to kill
himself. His brother was so worried about him, his uncle had enough.
He talk to Xichen about what's happening with his nephew

Just like him Lan Xichen was also worried about his
brother, He can't take if his brother will also leave
him just like their parents. He want to help his brother
to move on, until one day he find out that his
brother body was getting weaker day by day, Lan Xichen
Didn't know what his going to do.

Then, there's an unexpected visitor that came.
And Lan qiren couldn't believe what he saw. It was
the Immortal Boashan Saren his old classmate not
just old classmate but also the Immortal God
and Wei Wuxian Grandmother
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Wei wuxian Grandmother told lan wangji to not end his life and still continue his Journey, He still need to clear his beloved name and wait for his time to pass, and Wei wuxian Grandmother told him in the next recreation of them two it will be different because Wei wuxian is not a man anymore but a woman