Liu Xiang Xiang had a dream where she was in Kingdom of Chu and became assassin, and had four opportunities to assassinate the prince Mu Chun Shen. If she failed, she was poisoned to death. In order to complete the assassination mission, she turned into a maid, a guard, and a beggar boy in the prince's mansion. Every time the assassination was about to succeed, there would be unexpected surprises. In the process of fighting against Mu Chun Shen, she gradually discovered Mu Chun Shen's kindness and sense of responsibility, and gradually fell in love with Mu Chun Shen. At the same time, she realized that there was a background/history behind this assassination mission.