In the dark times of the martial arts world amidst turbulent mountains and rivers, Zuo Qingci is a young man who comes out of seclusion in search of a lost treasure of the imperial courts. Along the way, he encounters the bandit Fei Kouer who wears a disguise. Zuo Qingci (Zhang Yao) is the son of a marquis who hides his noble roots to travel in jianghu as a physician. He is searching for the missing scroll of the mountain river painting, a precious treasure that belongs to the imperial courts. He meets a bandit who goes by the name Fei Kou'er (Zhang Yaqin). Her background is a mystery as she wears a disguise on a mission to save her master. When it is revealed that she is actually Sun Yunluo, the young miss of the Zhengyang palace, she becomes a target of attacks. Zuo Qingci does not hesitate to save her even if it means being caught in the chaos. At this time, the marquis manor is framed by Weining Hou (Lu Xingyu) which forces Zuo Qingci to get involved in the affairs of the nation. Sun Yunluo accompanies him in his investigation that leads them to discover a secret from many years ago. They go to the ends of the earth together as lovers and comrades as they shoulder the burdens of the country side by side to bring down the enemy and restore justice.