Ding Peng (played by Louis Koo), the descendant of the meteor outside the sky, is a rookie in martial arts, and after he wrote a war letter to Liu Ruosong (played by Zhang Zhaohui) of Junzi Sword, Liu Ruosong postponed the competition by one DDD on the grounds of his father's funeral. Ding Peng met Qin Keqing (Wen Bixia), who pretended to be the dust and was actually Liu Ruosong's wife, in the Qinglou, and her embrace and meticulous care made Ding Peng fall in love, so he sent a sword book of a meteor as a token of love. The competition with Liu, which was postponed for a month, came unexpectedly, but Ding Peng didn't know that he had already fallen into Liu's conspiracy and calculation, the competition failed, the family heirloom was put into the pocket of others, and his beloved betrayed him, Ding Peng had no choice but to jump off the cliff and escape. On the road of endless people, he escaped death and drifted to a paradise called Forgotten Worry Island, accidentally met Qingqing (played by Liang Xiaoice) father and daughter, learned a peerless knife technique, and returned to the Central Plains with a full moon scimitar to repay the old hatred and win the rivers and lakes. However, just when Ding Peng unexpectedly learned that the Full Moon Scimitar was a martial art of the Demon Sect, the contradiction between good and evil in his heart made him fall into an endless struggle... The film is adapted from Gu Long's martial arts novel of the same name "Full Moon Scimitar".