Jooheon hated his half brother more then anything in the world. He promised himself he would do anything to make the kid life miserable. Because of his hate for him. changkyun almost lost his life, when they were kids. Cause of that incident there father thought it was the best if the boys lived separate. They meet again in high school and jooheon hate only grew. 6 months of fights and getting warnings from school. But after changkyu ends in the hospital without any warnings. jooheon promise his teacher he would go check on changkyun in the hospital. Only to discoverers the guy he hates has a brain Tumor.