At the center of the Investigation Factory is Shen Chen, with four symbols under him: East's Azure Dragon, South's Vermilion Bird, West's White Tiger, and North's Xuanwu, representing the twenty-eight constellations of the four directions.
These individuals have honed their martial arts to perfection and execute their tasks following Shen Chen's orders.
Eventually, the foundation of the Investigation Factory was firmly established in every corner of the Daqing Dynasty~
South is vermilion, paired with the bird, the seven constellations of the southern sky, the essence of fire.
A poem says: "The Vermilion Bird soaring through clouds stands out, the Azure Dragon rides the mist circling high beams."
