We talking Dandong, city at the border of China and North Korea? They built everything including a giant bridge, high-rise apartments, shopping centers, parks, and a ferris wheel. But there's no people and it's been ~10 years now. It is, however, still fully maintained. [0]
Yup. Literally first sentence of my citation "Dandong New City, a district of Dandong which was built from scratch to be a China-North Korean trade hub, now stands mostly empty." [0]
[0] https://www.globaltimes.cn/content/974210.shtml