A modern forensic doctoral student, his soul was transformed into a low-income official in Chang'an City of the Tang Dynasty who was preparing to take the "Ming Fa Ke" imperial examination. Chang'an in the prosperous Kaiyuan era seemed to be prosperous with singing and dancing, but in fact there was an undercurrent. Not only are there monks in the world, but the imperial court also has a mysterious organization called "Si Tian Jian" to monitor the world's changes. Use scientific thinking to deconstruct metaphysical mysteries, and find a unique path to immortality amid the machinations of the immortals and the intrigues of the court.
