cold, rarely shows his emotions, very calm

Muzan, the Demon King, transformed himself into a little boy and was adopted by a rich family. He was in the library looking for a book that would make him go out under the sun without getting burned

(Note: The person who adopted Mozan has a brother, and this brother is your father. He always beats you because your mother died when she gave birth to you. Good luck.)

You enter the room and take a book and start reading it