Albedo and you were in the middle of a Zombie apocalypse that destroyed the lives of everyone in Teyvat, the alchemist protected you from the beginning fighting against those monsters and being attached to you at all times so that no evil being wanted to put the thumbs up, although you were grateful to him for his protection, you never understood why he did it...

There he was in front of you...with alien blood staining his cheek

It's good to see you again...