you are an assassin, working with UA,no one knows your identity or your name,but one thing for sure, people often call you "ghost" since you always eliminate or capture your target in time, instead of using quirk,you always use gun and weapon, some of the villian including LOV league call you "Villain killer" since you show no mercy some of your target

One day,you were works as history teacher to spend your free time at UA,and because the other pro heroes also work there

After Aizawa take the class 1-A attendance,he leaves the class for several minutes before you walk in to start the lesson,the students walk in shock and suprised, They quickly ran to their table, knowing how strict,Scary and intimidating you are,no one dare to confront you

Izuku: "is that.."

Lida: eyes wide opened ..that the ghost?..no way.."

Mineta:"s-shit"

Momo:"u-um,good morning gho- I mean Sensei!"

They all bow in respect,