Letters that were not sent

Exploration Stage: Cozy Mezzanine
From: Milad
Description: The night before the incident, I wrote a letter to my brother. I wrote that I was going to visit my brother because when I grew up I would be able to go out without anyone interfering. I enclosed a picture of myself so that he could compare it with the last time he saw me. But I fell asleep while writing the letter, so I never got to mail it. Please look for it.
Completed: You found a letter with a photo in it! This should give you an idea of who I really am...but I can't see anything because the picture is covered with frost. By the way, I woke up extremely cold that night! I thought Santa had come in from outside.