Looking for one fanfic more information 
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FIRST FANFIC
It happened in Gusu Lan, Lan Wangji and Wei Ying fainted they bought them to the infirmary room trying to find out what happened. They were also holding hands  JC also try to pull their hands of each other but couldn't.and Wei Ying had a nice scent also had kids, died that's why they travel back in time, and Wen Ning travel with them and human too. 

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