Looking for one fanfic more information 
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FIRST FANFIC
If I remember correctly in this story it's about Lan Wangji, Jiang Cheng, and Nie Huaisang going back to the past to fix everything and save their lives ones. However, Jiang Cheng is only going back to save his parents, sister, and his people and blames Wei Wuxian so strongly for losing them. When they succeed in traveling to the past Lan Wangji and Nie Huaisang found out that Jiang Cheng erased Wei Wuxian from ever existing. Also, Lan Xichen and Nie Mingjue are together 

Please let me know if anybody knows the title in the conversation