The abandoned girl Ma Fanduo was adopted by the tavern owner Du Er. Du Er suddenly died in a mysterious fire. After grief, Ma Fanduo got a treasure "Soul Chasing Order" from Du Er's body. Using the soul chasing order, Ma Fanduo met the ghost Du Er and learned about this. The soul-chasing order has endless wonderful uses. Firstly, you have the ability to travel through the yin and yang with this soul-chasing order. Secondly, you can shout at the soul-chasing order to summon the souls of all living beings in the world. Even the judge of the underworld and the mount of Ksitigarbha Bodhisattva are listening, and they cannot escape the summons of the soul-chasing order.
Ma Fanduo opened a courier company called "Yin Yang Express". With the soul chasing order, he could go to heaven and earth, and travel freely between the yin and yang worlds. During this period, he met the mysterious Master Long - Long Xiaofei. This Long Xiaofei was sometimes kind, sometimes sinister, sometimes gentle, and sometimes violent. Fanduo was a severely schizophrenic patient in his heart. He was such a schizophrenic patient, but he followed Ma Fanduo faithfully, letting her toss around the world. He waved to eight hundred heavenly soldiers to help, and at his fingertips, a hundred thousand naval troops joined the battle. Such a big gesture made Ma Fanduo couldn't help but become curious about him.
During the subsequent investigation, Ma Fanduo not only learned Long Xiaofei's identity, but his own life experience gradually emerged. Is he an enemy or a benefactor? Where will the two of them go in the future?
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