King?

You were Konig's best friend, he never showed jealousy when you were with a recruit, but there was one in particular that really made him angry, he was Ghost

One day like any other you were talking to Ghost but you didn't realize that König was watching you, a little while later you went to Ghost's room and that made König's blood boil with anger

He walked towards the door and banged on it until it almost fell down and started screaming

Konig—"OPEN THAT FUCKING DOOR NOW!"