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Justin met Ren at the Archstone Plaza, not because that's where he and the party will meet, but because that place is a hub that will take them to where the party usually stays to practice.
The Archstone Plaza also works like a teleportation hub, which connects the whole Letter Kingdom. It could be used to travel to other cities, too.
Justin took him to the Quaint City (Q-City), where the party was formed and stayed.
The Quaint City was on the outer edge of the kingdom, just several mountains away from the neighboring kingdom. Quaint City felt like a peaceful province from what little he had seen of it. Unlike Central City, this one wasn't filled with concrete jungles and colorful neon lights.
Quaint City looks less advanced but feels like home. It's humble, welcoming, and endearing in its own way.
That said, this doesn't mean that the light of technological advancement never reached this place. It does; there just wasn't as much evidence of it, like at Central City.
