Verified answer

It's Que vas a hacer si la gente nos ve ?. Vea is a subjunctive and not gramatically correct in this instance.

I think this is what you're trying to say but I might be wrong:

Que vas a hacer si la gente nos ve?

What will you do if people see us?

or

Que vas a hacer si la gente nos viera?

What would you do if people saw us?

but:

Que vas a ser si la gente nos viera?

What will you be if people saw us?

or

Que vas a ser si la gente nos ve?

What will you be if people see us?

¿Qué vas a hacer si la gente nos ve?

Que?