Xu Moqing, an online joker who makes a living by complaining, unexpectedly awakens the [Humor Upgrade System] after the end of the world. While others fight zombies to level up, he relies on telling jokes, making up jokes, and engaging in performance art to level up. While his cousin Xu Aotian was showing off his power with the awakened lightning power, and his cousin Xu Xuewu was building a garden castle with her spiritual power, Xu Moqing was telling zombies vividly in stand-up comedy. "Smile, ten years later, how can zombies explode with equipment after laughing to death?" As the jokes became more and more outrageous, Xu Moqing found that his skills began to develop in strange directions: [Speaking as You Say·Cold Joke Version] can freeze enemies into ice sculptures, [Homophone Critical Strike] can make tanks disintegrate on the spot, and [Unexpectedly, Reversal Technique] can instantly reverse a fatal situation. When everyone was desperately looking for high-end supplies, Xu Moqing obtained the [Humor Value Converter] that can upgrade any item. So, he told a joke to a mineral water bottle, which evolved into a spring of life; he told a talk show to an ordinary dagger, and the dagger turned into a space slashing weapon. His cousins were jealous of his abilities and suppressed him everywhere, and even secretly colluded with the Lord of Doom to kill him. Unexpectedly, Xu Moqing's impromptu joke directly caused Doom Lord's million-strong zombie army to self-destruct collectively, making the Lord angry and vomiting three liters of blood. Zombie King? In front of my jokers, they all praise me!