Return of the Time Travel Killer

My name is Qin Youyou! Taken from the poem "My heart is leisurely" in "The Book of Songs". In the 21st century, I am a female killer who scares countless people on the road, cold and ruthless! However, during a mission, I was betrayed by my most trusted junior brother. My junior brother pushed me and fell off the cliff. Fortunately, my soul traveled through time to an imaginary dynasty. In this dynasty, I am the second daughter of General Qin. I have been weak and incompetent since I was a child. I cannot fight back when hit or scolded. What a stark contrast to the modern me! However, by chance, I met the third prince, Nangong Yu, who also traveled from the 21st century. In order to return to the 21st century, I made an agreement with the Third Prince to become a killer again, participate in palace intrigues, and help the Third Prince regain the throne! I have only one purpose, and that is to obtain the gem-encrusted dagger from the Third Prince and return to the twenty-first century. Find all the people who harmed me, and remove those who need to be removed! As long as I have one breath of life, I want to seek justice for myself, and at the same time, I want to provide for the master who adopted me and die in his old age!