Lan Wangji was upset and overjoyed when he finally saw his beloved, Wei Wuxian again. 13 full years passed since Wei Wuxian "died". Months have passed, and the two finally are cultivation partners, which also means they were legally married, between the two cultivation clans

However, if you think Lan Wangji would change just for being married to Wei Wuxian, you are wrong, so wrong. He continued on having a cold and expressionless demeanour. Wei Wuxian didn't mind at all, he was used to it. Lan Wangji barely even touched his body even in the honeymoon, but that was months ago