Is there a place that someone looking for some travel inspiration can take from you? I think the second city, like as a general rule, it's going to be more affordable, you're going to have less foreigners, so more of a chance to meet local people who maybe aren't overwhelmed with how many foreigners there are.
So like right now in Korea, I'm talking to you from Busan, which is the second city, and I can list a lot of advantages over going to Seoul because of how more of an authentic experience I'm having, but still having the comforts of being in a city. Obviously you're going to be even more authentic if you go to a village somewhere, but the city life I happen to enjoy, so the second city in a lot of countries, I'm a huge fan of basing myself there for a certain period of time to get to know the culture in a different way, and generally I tend to be one of the few foreigners who is in that city to be able to have a bit more of an authentic experience.