The Glory (2022)

Description:

It's a sad revenge story that begins with a high school student who dreamed of becoming an architect. However, she had to drop out of school after suffering from brutal school violence. Years later, the perpetrator gets married and has a kid. Once the kid is in elementary school, the former victim becomes their homeroom teacher and starts her thorough revenge towards the perpetrators and bystanders of her bullying days. (Source: Soompi)