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During the Zhenghe period of the Han Dynasty, Prince Liu was accused of witchcraft. The emperor recalled Bingji, an official he had denounced, to Chang'an to solve the case. Unexpectedly, since the first day that Yan Ning, the bodyguard of Tingwei Bingji, returned to Chang'an, murders became more frequent, and a series of inside stories about the conspiracy seven years ago were slowly revealed... Everything stems from the snowy night Yan Ning left seven years ago. Mu Yilang, a hot-blooded young knight who had the blood of Loulan nobles but wandered into the streets of Chang'an, later turned into a cold-blooded assassin; His deceased brother Yan Ning, seven years later, became a Tingwei bodyguard hunting for him everywhere. They all regarded this friendship as life, but why did they meet with each other and fight to the death? They didn't know that as early as seven years ago, a huge conspiracy had been laid intertwined. What price should the two people who were entangled in the grievances of the palace and the world have to pay for mutual redemption to be considered loving and righteous? The Ten Cases in Chang'an are both sins and atonements.