The Princess Who Lives in the Cold Palace

She is the eldest princess, with red makeup for ten miles, and is married to Pinglehou, who has the merit of following the dragon. On their wedding day, the prince of the former dynasty who had been missing for a long time shot her husband in the street, bloodbathed the palace, and stabbed her eldest brother to death with a sword. She went from the eldest princess respected by thousands of people to the most humble maidservant. She knew he was here for revenge. She couldn't bear the humiliation and hit a pillar in the palace in order to die. When she woke up, a mysterious voice said to her: As long as you complete your mission, you can go back. Complete the task, complete what task? Where to go back?