There was a novel about a woman who transmigrated to the Sui Dynasty and became the empress of the Sui Dynasty. Then, she had a relationship with an emperor of the Sui Dynasty. Which novel was it?

The name of this novel was 'The Empress of the Sui Dynasty'. This was a time-travel novel set in the Sui Dynasty. It told the story of the heroine, Yang Su 'er, who traveled to the Sui Dynasty and became the Empress and Emperor Yang Jian. The novel described the deep affection and devotion of Emperor Wen of the Sui Dynasty, as well as Yang Su 'er's diligence and warmth as an empress. It presented a true historical image of the Sui Dynasty and Emperor Wen of the Sui Dynasty. The novel was very popular and had been adapted into a TV series and movie.