Back in the Tang Dynasty, the Bad Screenwriter Started as a Spy in Chang'an

Chang'an City seems to be a prosperous scene, but in fact it is undercurrent. There are monks and wizards; there are spirits and evil spirits; and there are secret spies from various countries. All forces gathered in Chang'an, and a catastrophe was about to come. Li Cheng, a screenwriter who specializes in spy movies, traveled back to Chang'an and became a secret agent. All you need is a piece of paper and a pen, and all unsolved cases can be solved. "Zhang Guolao is my teacher, and Li Bai is my friend." "I, Li Cheng, am not just a secret agent."