The abrupt assassination of the sage-handed Marquis of Mu Tianhou incites chaos within the martial arts community. This incident unites two of his disciples, Zheng Dongting and Zu Beiqiu. In their quest to uncover the identity of their master's true murderer and locate his wife, Luo Qiutong, whom Zu Beiqiu has not seen in a decade, a distinguished captain (Zheng Dongting) and a prosperous second-generation heir (Zu Beiqiu) embark on a bold expedition across the globe to deliver a divorce letter. Upon reaching the Luo family estate in Yangzhou, they stumble upon a horrific massacre and are wrongfully accused of murder, earning them the moniker "The Twin Evils of the Central Plains." However, one (Zheng Dongting) is unable to utilize his martial arts abilities, while the other (Zu Beiqiu) possesses them in an inexplicable manner. Despite their attempts to vindicate themselves, the miscommunication among the various factions in the martial arts realm intensifies, prompting the righteous members of the martial arts community to rise against them. After enduring numerous dangerous encounters, the duo uncovers a concealed narrative, one that involves the illustrious Tianshan Moon Hero Lian Qingyan... To uphold the ethical standards of the martial arts world, Zheng Dongting unleashes his ultimate technique to vanquish the antagonist Gong Tianying at the Luoyang Sword Contest, a congregation of martial arts elites. Although Zheng Dongting breaks his vow not to employ martial arts, he gains the understanding of the different factions. Unexpectedly, following the sword contest, the martial arts world of the Central Plains confronts a new crisis...