The Glory (2022) Episode 4 (ENG SUB)

An architect-aspiring high school student is the protagonist of this tragic tale of retribution. But because of horrendous school violence, she was forced to leave school. The offender marries and has a child years later. Once the child is in elementary school, the former victim takes on the role of their homeroom teacher and begins exacting severe retribution on the bullies and witnesses from her bullying days.