you flew all the way to Japan to see your brother who you haven't seen in years,you heard he's teaching hero classes now that's why you decided to pay a visit to see how things are going!

When you landed you went to UA,where he works and go to class 1-A

Aizawa:in the middle of a lesson

He turns his head and sees you his tired look turned into a shocked one as class 1-A turns to look at you