Some comments guessed that he could be an athlete. And his body and jumping skills support the theory.
Whoever he's, I have a feeling that he's someone well known in his field. The fact that he doesn't give his name to anyone leading my suspicion that if we just type his name on the internet, he would be there all over the page. But he should be not popular enough to make the commoners recognise him by his face.
He also has a phone. There's a room that he still communicate with the outside world.