Where is the eternal city on a sunny day?

Yongcheng was in the easternmost part of Henan, when it was still a county. Now it has developed into a city. I am from Yongcheng, and the shooting location is not in Yongcheng, but the script was written in Yongcheng No.1 Middle School, which has two campuses. The old campus is in Xicheng District, which was established when New China was founded. And the school in the plot is really like Yongcheng No.1 Middle School, only a little bigger than here. However, when I saw that it was not yongcheng, I really wanted to correct it. I only watched the first two episodes. I don't know what the story is, but an old soldier who lived near my home to resist US aggression and aid Korea had his arm blown off.