Does anyone know the title?

은색 April 5, 2021 4:49 am

I remember seeing a manhwa recommendation on a tiktok compilation on yt, and the part I remember was that the mc was being bullied and he told the teacher (or classmate?) and she said "so what?" and the mc said "I knew this was gonna happen" and pulled out a gun (a long one so I assumed it was a sniper) and killed everyone in the classroom. Does anyone know the title?

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