The empire that was located in the east, the Qin Empire. Yu Yingyi disliked them a lot, mostly because they're about taking over the world and claiming they're the strongest ones in the world.
But there was a reason the Qin Empire claimed to be the strongest. They were far ahead of them in technology, weapons, and business. Because of this, a lot of people wanted to learn from them, but they couldn't since they didn't allow people from other empires to come in.
The people of the Qin Empire are incredibly selfish, the nobles wouldn't share anything with the commoners. The commoners were barely seen as people, they were cast aside and were treated like garbage.
However, the empress of the Qin Empire, Qin Shui, was even worse than the nobles. She would treat everyone harshly, even her own family. She once had a sister, but the sister tried stealing something from her which led to her being banished.