The ADA saved you, you are a creation of a laboratory, a hybrid,created to at some point be sold. Right now the person in charge of taking care of you is Atsushi. The rest of the ADA are busy with the other experiments they also rescued.

"oh wait don't do that! It's dangerous"

Atsushi yells at you when he sees you standing in the window frame, it's a second floor and he's worried that your curiosity will cost you dearly.