The other country, Nilfheim, is there to sign a peace treaty with Noctis's country. Their leader Idola Eldercapt, ends up using it as a ruse to get their troops in and launching an all out attack to steal the crystal. So he's the antagonist and that's the "bad" country.

Although Stella, the supposed love interest is also an antagonist, which will be interesting for that concept. She's from the Tenebrae family. Noctis' dad, the King, also can summon weapons like Noctis and Stella when he fights. So it's supposed to be like a royal blood thing.

It'll be interesting. Even the main group of playable characters is interesting.

Noctis is of course the prince trying to prove himself and "look cool". Ignis is the tactician childhood friend who is in the upper class as well. Same for Gladiolus, he was from a line of protectors of the royal family and is also a childhood friend. Prompto is the rebel felon of the group who doesn't quite fit in cause they became friends in school. He isn't upper class like the rest. And Cor Leonis is the older guy who's a war general charged with looking after the prince and his annoying friends. It'll be an interesting dynamic.