Secrets Box

One day, when I was sitting in a normal room, I found a wooden box locked like this, and I don't know who it belonged to

I was curious to know what this belongs to. I kept looking for the lock key right and left until I found it in a drawer.

I opened it with the A key, and after that, I found a lot of paper inside the box, so I pulled out a piece of paper to read it. Thinking of a mistake, I found myself the head of...