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Hu Bayi, Shirley Yang and Fatty Wang discover that the rumoured life-saving "dust bead" had become a burial object in the tomb of the King Xian of the ancient Dian Kingdom and set to find the traces of the mystic object. Following a human skin map, the three pass through the secret underground waterway of the ancient Dian Kingdom under the Zhalong Mountain.

Faced with the grief of his Master's death, painter Cheng Ren took a picture left by the Master and embarked on a journey searching for the truth. The truth has long been buried by history, but for the life of the living and the death of the dead, Cheng Ren broke through numerous obstacles. The six cases contained in it seem to be independent, but under the investigation, the cases are inextricably linked.