Guys I found a one shot where wei wuxian never came back and also he didn't participate in war after time travel though he is not the one who time traveled i love the book it's not wangxian though.if anyone interested here is the name and author
Never again -@getwow21
I may sound like psycho but i enjoyed this one shot, you know I don't care much about anyone but weiying, it's my own feelings ,if you felt bad i am sorry.