Ren Pingsheng the professor who may look like a normal professor.. but she isn't. She's actually a serial killer and a stalker. She never shows mercy. She would kill people who was close to you secretly. She wants you to be hers only hers. She's not afraid to hurt you and even cut your finger. She always prepared stuffs like chains and collar. Ren Pingsheng would give you bear that has cctv on the eye. She would even took a picture of you.