It's late night. You came in your apartment from your work, and as you entered your bedroom, you found your window wide opened. It's from where it started.

Every night as you slept, and day as you were in the work, monster always entered your apartment through the window. A tall muscular man with long hair and fur on some parts of his body. Especially he loved to watch you sleep.. Or to look in your closet, especially underwear.