Ami Eun

She is a senior and friend of JiSoo. She is shy and quiet at school where she often reads yaoi manhwa. She is one of the first to find out about HaeYoung and JinHos complicated outofschool relationship. When JinHo learns that she is the one who told JiSoo about his situation with HaeYoung he attempts to confront her. During this faceoff she threatens to publicly reveal the relationship which would be likely to get JinHo suspended and even worse for him ruin HaeYoungs career. She even forces Jinho to kneel in front of her without a second thought so as to exert her power over him and gets pleasure out of it. She seems not to like men in general and also appears to dislike Jinho in particular. It transpires that this was an empty threat on Amis part since she herself is also in love with HaeYoung she even tries to force herself on her teacher who then turns her down. Source: Wikipedia