Lady to Queen

Lady to Queen manga summary:

An empress fell into a trap, divorced and was cut off by her family. In the last minute of her life, her sister Lizzy regretted how things ended up. “Only if I were the empress“ she would make sure not to love the emperor. Everyone will be happy without dying.
When she opened her eyes, she returned back time before she became the Empress. In order to prevent a recurrence of the tragedies of her past life, Lizzie makes a final decision: “I will become the queen instead of you.“ Can Lizzy, who became an empress, live a happy life?