
I CAN ANSWER THIS BUT WITH A SPOILER SO BEWARE
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A-Yuan is Lan SiZhui, he was a Wen, Wei Ying protected him and the Wen Remnants and treated him like his own child. When Wei Ying died, Lan Zhan saw him on Burial Mounds and took care of him. He made A-yuan a Lanヾ(☆▽☆)
Lan Zhan gave him a courtesy name "Lan SiZhui"
SiZhui loosely translates to yearning...it means his yearning for Wei Ying

Aww. When Lan Zhan feel for Wei Ying, he feel so heard and completely in love. I still love drunk and jealous Lan Zhan. Even better jealous drunk Lan Zhan.
So is this arc Wei Ying's memories he forgot? I can't wait to see when he remembers his love for Lan Zhan. I saw some are of Wei Ying using Bican(I think that's the swords name) as a toy. Is that canon?

MIGHT CONTAIN ANOTHER SPOILER!!
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Wei Ying didn't remember what happend in the Nightless City and how Lan Zhan confessed to him ╥﹏╥ Wei Ying was so dense of his feelings for Lan.
He'll realize that he loves Lan Zhan soon (Ch.95 on the novel) and confesses to Lan Zhan on Chapter 100 on the Novel(๑•ㅂ•)و✧
Yes, its canon! Wei Ying used Bichen as a s*x toy lol (Incense Burner Part 2)

It was actually a hollow tree and most likely Wei Ying left him food and water. Lan Zhan broke out of the Cloud Recesses as soon as he found out that Wei Ying had been killed. It takes about a half day to get to and from Gusu from YunMeng by boat so estimating that it takes about 2-3 days round trip via sword, A'Yuan probably wasn't left alone for all that long and it could be the stress of it caused him to fall so deathly ill that he forgot when he was When Yuan and only started to remember who he was after tasting Wei Ying's cooking in Yi City.
So far the only Wen I like is the Ghost General. He's adorable and hot. Who's with me?