Based on ancient Chinese mythology, the world of Dream of Mirror Online exists as an alternate reality inside the "Kunlun Mirror," a sacred artifact. According to the legends, the world we know was born from the Kunlun Mirror, and the mirror contains the power to destroy the world as well.
The Kunlun Mirror was originally created to record everything in the world. It reflects the real world and saves a copy of everything within itself. This copy is known as the Kunlun Mirror world. Time does not exist in the Kunlun Mirror world, only in perceptible signs like sunrise and sunset, and the seasons. The caretakers of the Kunlun Mirror world, the Twelve Mirror Kings, are responsible for guarding and overseeing the Kunlun Mirror world.