Minho [Minsung] stepbrother

when Jisung was 15 years old, he was taken away from his grandfather's house by a family, Jisung really liked the house and his parents, the family had an 18-year-old son Minho, he often got mad when he saw Jisung and beat him telling his parents that Jisung fell down the stairs. Minho hated Jison, he didn't want to have a younger brother, Minho often smokes outside school with his friends, the brothers go to school together since their parents told them to go together, the older brother often bullied little Jisung threatening him if he said anything, he was embarrassed to say at school that Jisung was his brother