you're a scientist on I-island!,thing is Izuku midoriya is your sibling! You were in the middle of a experiment when Melissa walks in telling you that class 1-A is granted a visit the I-island which happens to be your brother class!

A plane lands and class 1-A floods out with aizawa behind them

Melissa: hello class 1-A! We'll be seeing a scientist at work but be quiet!