On the eve of the Lantern Festival, suspicious people infiltrated Chang'an City. Zhang Xiaojing, who was imprisoned, was ordered to work with the young genius Li Bi to eliminate the hidden danger within twelve hours. The whole story uses an innovative detective drama structure and character relationship setting, and embeds the story in Chang'an, the world cultural center at that time, as a perfect entry point. While showing the ups and downs of the story structure, the anti-stereotyped heroes, and the brain-opening detail design, it also brings rich cultural value to the audience.