There's a Knife Behind My Sister's Back

There is a sword in the world that can bring peace to the world. There is a sword in the world that can control the life and death of various sects. The queen has a sword that can kill all living beings and monsters. The Li family of the Tang Dynasty was as wealthy as the country and controlled the royal family's financial lifeline. The eldest daughter of the Li family, Li Yushu, was known as a peerless genius. She manipulated the world, killed treacherous ministers, beheaded corrupt officials, destroyed mountains and rivers, and put an end to chaos. However, what the world doesn't know is that the knife behind the eldest lady's back is the real killing machine. "Sister, 30% is enough." "Sister, do you need me to do it to her?" "Sister, if you dare not kill, I will kill you!"