Luanchan just happens to lie on the 111 Meridian East. Subsequently its geographic flag has a complete background of red. In addition since it is on the 33 parallel north it gets an all upright latitude star.
Note that red is coded to 1, since red is the first colour of the rainbow. Likewise yellow is coded to 3, as it is the third colour of the rainbow.
Using Latitude Longitude key here, you can fly this flag anywhere along this geographic space.