Xiao Shiyilang (played by Yan Yikuan) is a well-known thief in the arena. He joins hands with Feng Siniang (played by Li Yixiao) to steal the long-lost artifact, the Deer Cutting Knife. Shen Bijun (played by Gan Tingting) is the daughter of Wulin leader Shen Feiyun (played by Wang Yitong). She is about to be engaged to Lian Chengbi (played by Zhu Yilong), and Shen Bijun's dowry is this Deer Cutting Knife. Once upon a time, the young Xiao Shiyilang and Shen Bijun had a beautiful time of childhood sweethearts. Now that the two meet again, the gears of fate are turning. The existence of the Deer Cutting Knife put Shen Bijun in danger again and again. Fortunately, Xiao Shiyilang rescued her and was able to escape danger many times. In the process, Xiao Shiyilang and Shen Bijun developed a sincere relationship, which made the iron-blooded and cold Lian Chengbi hate him. Under the instigation of Shen Feiyun, he decided to get rid of Xiao Shiyilang. At the same time, the leader of the Demon Realm, Xiao Yao Hou (played by Ray Lui), is also ready to stir up a bloody storm in the world.