Kuā'li (Yā'mon I) is the first planet from the sun of the Yā'mon system, Xi'an Empire. Tidally locked to its star, one of its sides is in permanent daylight, and the other in permanent night.

During the Xi'an-Human Cold War, Human military intelligence identified a facility located on the dark side of Kuā'li that saw frequent traffic and was under heavy guard. Reports suggested that it was a maximum security labor camp. In SEY 2788, the facility was suddenly torn down and the planet left unguarded. The Xi'an Empire denies that they operated a labor camp on Kuā'li, but have not offered an alternate explanation of its purpose.