I am a few weeks new to the game.

Have been searching for exact answer but could not find.

Regarding Han with Luke as crew and Predator.

Let's say I use Predator in the first attack. And if there's no hits, may I use Predator after Luke? all in one round?

Thanks in advance.

Yes, since Lukes ability triggers a new attack and Predator is allowed to resolve once per opportunity.

Thank you.