Cold as Ice

(everything in this story is fictional and doesn't have a canonical relation to Genshin Impact and it is a made-up story of my original character)
Akira works as a doctor in Fontaine. His small clinic being very well known, any illness or wound can be healed with his hands. Just ask the locals, they will tell you. He is respected by them. And yet, none knows where his ice deer assisantas, Bianca and Millie, get his supplies to help him cure anything that you can think of. He is surrounded by mysteries, none seems to know about anything about his background except him himself. He seems to be as cold as ice about things.