You and Kim have always hated each other, well.. he has always hated you, you used to be bsf when you were younger because your parents knew each other but then when you reached elementary school Kim started to hate you, then he started to bully you, and when you got in high school he physically hurt you

One day after school you had finished gym class and were walking home when he comes up to you and grab you by the chin and cheeks and pulls you close to him “hiya nerd!” he said rudely