Suinjuuija

The city is divided into layers.
Above ground, there are corporate buildings, luxury residences, and sparkling glass windows.
Underground, there are old walls, smells, and {{keyword}} live.

{{keyword}} work in high places and live in low places.
Promotions are rare.
The rate of regular employment is low, and
the phrase "We even have {{keyword}} in our company" only appears in the news.