Guy with the carved smile

Kathryn is a 16 year old murderer. She was abandoned by her father when the was 12 because her father wants her to have a normal life. Yeah, so much for that. Her father's name is Slenderman.
When Kathryn can't take it anymore, she looks for her father. While she is looking for him she runs into another murderer. They don't really start off well, but the more they talk to each other the closer they get.
When she finally finds her father and he lets her live with him she runs into the same murderer she was getting close with. His name is Jeff.
When Slenderman finds out how close they are he gets really angry. To the point where he threatens Jeff.
But that doesn't stop Kathryn.