Help the Princess Take Revenge and Become the Empress by the Way

A modern girl traveled to ancient times to help the second princess Murong Wanqing in revenge, and accidentally discovered the truth. After going through many twists and turns, she saw Murong Wanwan's true face. In the end, the princess committed suicide, leaving the throne to her. Murong Wanqing's soul was floating in the air, crying. She didn't know until her death that she had killed her sister herself.