Do they put people with reserved seats and people who buy the tickets together? If you know what i mean :/

If you choose seats prepaid according to what's available

Yes they do. Whether you reserve or buy them there, you all sit together. The only difference is if you reserve, you get the best seats, while the ones that come in to purchase gets what's available.

First in open seating for your movie!

Everyone has a reserved seat that purchases a movie ticket. I love love that theater.