"The protagonist, Zhou Yi, is an ordinary deliveryman in Shanhai City, but he has always dreamed of joining the Shanhai Bureau and becoming a revered Demon Suppressor. However, due to his mediocre aptitude, he has repeatedly failed the recruitment tests. After yet another rejection, a disheartened Zhou Yi decides to give up on his dream. Just as he steps out of the Shanhai Bureau headquarters, an ancient demon suddenly appears. The Bureau is caught off guard, and its members suffer heavy casualties. In the critical moment, the chief Demon Suppressor, Lin Wei (the female lead), arrives. With her exceptional combat skills, she engages in a fierce battle and ultimately slays the demon. As everyone celebrates their narrow escape, no one notices that the stolen primordial demonic power of the gluttonous Taotiu has slipped away... In a dark alley, Zhou Yi, who had already fled, collapses to the ground, his body covered in glowing red runes. When he wakes up, he discovers he now possesses a system and spiritual energy. Soon, minor demons tracking the Taotiu's aura corner him. In a desperate moment, Zhou Yi unleashes astonishing power, transforming into a half-demon and effortlessly defeating the creature—only to uncontrollably devour its demon core. To understand the changes in his body, Zhou Yi conceals the truth and once again takes the Shanhai Bureau's recruitment test, this time succeeding. He becomes a Demon Suppressor and is assigned to Lin Wei's squad. As a Demon Suppressor, Zhou Yi utilizes the Taotiu's demonic power to achieve numerous victories, discovering that he can absorb other demons' abilities by consuming their cores. Meanwhile, a mysterious organization called the Hundred Demons Society repeatedly approaches him, attempting to recruit him. Zhou Yi gradually realizes that the entity dwelling within him is none other than the ancient demon Taotiu. During a battle against a powerful demon, Zhou Yi is forced to reveal his half-demon form in front of everyone to save Lin Wei. Exposed, he becomes a fugitive, hunted by the Shanhai Bureau. Though he rejects the Hundred Demons Society's offers, he eventually tames the Taotiu's will in a critical moment, rescuing the entire Demon Suppressor squad and earning their acceptance. With Lin Wei's help, he is reinstated—only for her to be captured by the Demon Emperor shortly after. Zhou Yi and his teammates embark on a rescue mission, uncovering the truth behind the Hundred Demons Society: they are not mere servants of demons but the true source of the demonic uprising. In the final battle, Zhou Yi and Lin Wei lead their team to victory against the Society, allowing humanity to reclaim their world beyond Shanhai City and rebuild their civilization."
