In the autumn of 1995, bizarre incidents frequently occurred during the construction of the Qinling tunnel. Excavators stalled immediately upon entering the cave, swarms of giant snakes blocked the way, workers crashed into walls to their deaths and went missing on the spot, and a stone tablet reading 'Do not dig here and bypass this place: Liu Bowen' appeared deep inside the tunnel. Young technician Lin Jianjun recorded the direct conflict between modern engineering and 'the rules of the mountain' in the first person. After the situation escalated, the mysterious state unit 'Bureau 749' took over. Section Chief Shen Yan entered the cave equipped with rune paper, peach wood swords, and 'spirit-locking instruments' to fight against the 'vein-guarding snakes' and grievance-condensing snake shadows guarding the dragon vein, ultimately sealing the source of disaster.