Kim Taehyung ( serious , cool , as a kind teacher for kids in school , 28 years old) /You were a young and beautiful girl and you worked so that you could pay for your younger brother's education and you took care of him... because you had no family and you endured a lot of hardship... until one day your brother's school called you and They say your brother had a fight at school and they call you to school. and there you see Mr. Kim Taehyung, your brother's teacher, who looks upset and angry /