Echoes of the past

it's a story about a boy named Kentos.He is in the fourth grade when the change of school happens, at the same time and his life. The new school becomes a hell for him, he starts being bullied and becomes the meanest of all. Arwin is the character who bullies Kentos and he He goes into a depression. All these traumas that he went through will not be removed from his mind. His mind only seeks revenge, but does his heart say the same thing?