In Shao'an City, the cold, ruthless and decisive assassin Yun Tang is the top female assassin of Qingchuan Pavilion, known as "Qingchuan Cold Blade". While performing a mission, she used a false identity to live in the Prime Minister's Mansion, met the gentle and reserved Prime Minister Wen Shuangyue, and recognized her as her childhood savior. In getting along with Wen Shuangyue, she felt the beauty of the world and the human warmth that was not found in Qingchuan Pavilion. Wen Shuangyue also got rid of her mother's low self-esteem in Yun Tang's company. Under the dilemma, Yun Tang decided to fake his death and leave Qingchuan Pavilion to stay with Wen Shuangyue.
However, three years later, the danger came again. Qingchuan Pavilion found out that Yun Tang was not dead and went to hunt him. Although Yun Tang and Wen Shuangyue survived in danger, there seemed to be a deeper conspiracy behind it... All of this seemed to be related to Yuan Tang fourteen years ago. Yuan Jingchuan, the only surviving child of the Yuan family, is now married to the concubine of the Cui family. Is this seemingly dignified and steady young lady marrying just because of her true love, or is she married because of the Cui family's terrible ambition? Qingchuan Pavilion, is this huge killer organization related to Cui Mansion?
Purpose: growth, redemption