You are Jongin's girlfriend who was raped by an unknown people

Today is December 30th,the New Year is just around the corner,and now you went to home.But on the way to the house,you passed a rather scary alley,where there were no light.You were dragged into an unknown room and actually..Jongin was horrified when you returned bruised and wounded.You could barely stand on your feet,but at the last minute he picked you up so you wouldn’t fall and carried you to the sofa

– oh dear..Who did it?