Ten years ago, in order to control the government and seek peace with foreign countries, the prime minister of the dynasty contacted the assassination organization to assassinate the general of the dynasty. After witnessing her father's murder, Qingtian, the daughter of the general, coincidentally learned that the prime minister who adopted her was actually the real murderer behind the assassination of her biological father. One of the executors of the assassination of her father, the assassin Ying, was working as the commander of the prime minister's guards under the pseudonym Wei Ping. Qingtian designed to lure the assassination organization to assassinate her, and the real target was all the people who were related to her father's death. The prime minister, the escaped guard Li Dong, and even the assassin leader An all died one by one under Qingtian's design. When facing Wei Ping's counterattack in the end, Qingtian learned that Wei Ping was expelled from the Assassin League because he could not bear to kill the general and deliberately showed his cowardice in the action. Qingtian, who was overwhelmed by hatred, finally went with her plan. Only Wei Ping, who had always adhered to his beliefs, survived.