Yun Shang (played by Hu Yiyao), who has been tortured since childhood, became the killer of Xiaoyu Pavilion in order to take care of and protect his sister. In the process of carrying out the task, he was moved by the simple and kind-hearted uncle Wu Luan (played by Wang Xuan), and then fell in love with Wu Luan., when her new assassination target was Wu Luanzhi, Yun Shang chose to put down the butcher knife for the sake of love and face her lover and relatives.