I'm a Courier from the Underworld

The junction of Yin and Yang, beside the Huangquan Road. When the ancient underworld meets the modern logistics system, a conspiracy spanning a thousand years also emerges. I am Zhang Wei, an ordinary courier and the selected "key". Hidden in this half-yin and half-yang body is the secret to restarting the "Nine Netherworld Breaking Formation". The left hand is Zhong Kui's demon-slaying sword, and the right hand is Lu Yin's Mingwen technique.