San has a symptom that is hard to control his emotions. And whenever the symptoms onset he will feel pain shot through his whole body but at the same time goes raged, it is a mental illness that is rare and hasn't a cure for this. Whenever it was onset he would be confined by the school until it was completely subsided. He stayed like that until he was in high school when he met wooyoung, a boy whose voice was like being kissed by an angel...... Might include- Suicide Bully Smut( it gonna be innocent for now