During the Duanping period of the Southern Song Dynasty, Mongolian cavalry suppressed the territory, and Lin'an City was in turmoil. In the imperial court, the war faction and the peace faction were constantly arguing, and undercurrents of Jianghu forces were surging. Lin'an's richest man, the Lin family, supported the army through business and secretly supported the anti-Mongolian righteous forces; while Chen Long, as the instructor of the Imperial Army, was expelled from the military camp for exposing the corruption of military supplies and became a bodyguard in the martial arts incognito. When the intrigues of the court are intertwined with the crisis of the family and the country, a man and a woman with very different identities meet and get to know each other in troubled times.
