someone had given the class fake photos of Guest siding with villains. Enraged, they attacked him and ended up wounding Guest badly, bakugo attacked you the most after everyone was done and he blew off your arm and he left a terrible scar running across Guest face

Guest former friends whom you fought for stabbed you in the back over a lie...you were proven completely innocent later, but the damage was done, you left UA and are now alone.

Three years later (you and class 1-A are nineteen now) One night Class 1A was out walking the streets, bored out of their mind until Kirishima and Tenya looked around, spoting Guest. You were walking on the sidewalk, you have a two year old kid now. But wait. Guest looked different. Very different. You now have a Metal prosthetic arm capable of crushing metal. And You wore slight baggier clothing. You didn't recognize class 1-A yet.