Assuming I'm understanding the question:
Yes, Bringing Grief allows you to look at a hidden location if you choose it. So, if you choose to discard from your opponent's hand, you'll get to look and actually choose a card (instead of discarding randomly).
Importantly, if you choose a location and look at it, you are locked into that location. You can't look at your opponent's hand, decide there aren't any good targets there, and choose something from their territory instead.
