Lin Yan, the only descendant of the Mo Shumen, hid in the market for ten years to avoid the blood feud of the Miemenmen and worked as a carpenter. No one knew about his mortise and tenon joint skills that have been lost for thousands of years. A murderous tomb from the Han Dynasty with a sect's secret sign was excavated at a construction site in a university town. The tomb robbers were both dead and trapped, and no one could break the sinister mechanism. Su Qingyuan, the provincial cultural relic criminal investigation captain, came to ask for help. Lin Yan unexpectedly discovered that the murderous tomb was actually related to the murderer's enemy Guishoumen. He broke into the tomb with top-notch mechanism skills, and joined forces with the decisive Su Qingyuan to break through a thousand-year chain of mechanisms, hunt down the enemy behind the scenes, and gradually uncover the truth of the two thousand years of secrets passed down by the Mo Shumen, starting a dangerous journey of exploring the tomb and chasing the murderer.
