Oh good, you found it, I was just looking for your post to link you! (your post reminded me that I had this one drafted, but then I had to go looking for the vid itself, which took me a while to find because Tumblr >.>)

Yeah, Zhao Yunlan having to wait for Shen Wei does have symmetry, though I'd prefer he just doesn't meet him at all until Shen Wei's properly grown up! (otoh if child!Shen Wei gets all his memories back, then it's just super weird...)

...And apparently the Chinese fandom theorized that Zhao Yunlan somehow was waiting 10K years for Shen Wei??