In the Daqian Dynasty, Cuju was very popular, and everyone from the emperor to the traders and footmen were crazy about the game. They even decided major criminal cases and border disputes based on the outcome of the game. The protagonist, Ye Xiao, was originally a watchman late at night. He was accidentally involved in a "Cuju case with human heads" involving royal secrets, and awakened his "negative emotion system." He discovered that as long as he made his opponents fearful, the audience angry, and the powerful desperate during the game, he could gain points to strengthen his body and senses.
In order to survive on the murderous court, Ye Xiao transformed into a "court devil". Not only did he have vicious skills, but he also used the watchman's keenness in the night to solve a series of serial murder cases caused by Cuju between games. As his status improves, he discovers that behind Daqian's "national football" there is a shocking conspiracy to sacrifice the national destiny, and he must use both feet to kick this decadent dynastic rule to pieces.
