Wu Yong, the most useless student at Dazhou Imperial College, accidentally activated the "mouth substitute system" and gained the dual ability of "prophecy + poisonous tongue" - whenever he complained about someone or something, it would definitely come true in the most outrageous way. At that time, the powerful minister Zhao Wuji wielded power in both the government and the public, and formed cliques for personal gain. Even the emperor wanted to look at his face. After Wu Yong was publicly humiliated by Zhao Wuji, he launched a domineering counterattack. He first "predicted" that the housekeeper of the Zhao family would be beheaded for corruption, but the next day the housekeeper was actually arrested for hiding a dragon robe; he also "complained" that Zhao Wuji's brother-in-law would be exiled for a poem, but he actually recited an anti-poetry after drinking. Zhao Wuji was furious and set a trap to destroy Wu Yong, but found that every time he framed him, Wu Yong's "venomous tongue prophecy" exposed him in advance. What's even more bizarre is that Wu Yong's complaints not only predict disaster, but also reveal the truth. He casually said, "The Zhao family is behind this corruption case," and a complete chain of interests was discovered. Therefore, the emperor valued Wu Yong and secretly used him to check and balance the powerful officials. Zhao Wuji wanted to win over Wu Yong, promising him a high official and a generous salary, but Wu Yong said venomously: "The grand master's cake is too big, I'm afraid of choking to death." The grand master was so angry that he vomited blood on the spot. As Wu Yong's status became higher and higher, he discovered that there was a bigger secret hidden behind this "mouth substitute system" - he was a loyal minister who was killed by Zhao Wuji in his previous life, and when he was reborn, he used his poisonous tongue to judge all darkness.