I went to Korea last year, I manage a R&T (older lady arranged through a telegram channel) and Donut Anma, bad thing is as foreigner you can't pick the girl and you have less option. The girls were both pretty open to meet outside but was flying out. Also if you have a chance you should try to find an opi, that is pretty much an escort service in an apartment, the girls should be better quality but still there are limitation on ethnicity. There are telegram channels to get a bit more of it. I didn't have a chance to try any escorting, but the price is significantly higher.