Lan Sizhui is from Gusu Lan clan and he studies in the Cloud recess. He is one of the seniors of the Cloud recess. His not blood related father is Hangaung-Jun(Lan WangJi/Lan Zhan) and his not blood related uncle is Zewu-Jun(Lan XiChen/Lan Huan),and his not blood related grandfather is Lan Qiren. He is originally from Wen clan. The one that took care of him before and now is Wei Wuxian(Wei Ying),his nor blood related papa/dad.
He is very calm,gentle,soft spoken,nice,kind and elegant Lan boy. 