After Wu Zetian knew that she was not liked by Li Shimin, she immediately shifted her goal to Prince Li Zhi. Li Zhi's Oedipus Complex was used to seduce Li Zhi. Later, even in order to reap the consequences for Wu Zetian, he ignored the etiquette and the advice of the old ministers left by Li Shimin.
The second step is to fix the harem.
After Wu Zetian successfully returned to the harem, she quickly attacked the Empress and Xiao Fei, trying her best to get rid of these two women and make herself the emperor's throne.
The third step is to get rid of the court officials.
Wu Zetian's life has been difficult because of the obstruction of the old court officials. So after she became the queen, she began to use Li Zhi's love for her to attack the old ministers.
The fourth step is to get rid of the husband and son.
Her husband was incompetent and she ate him to death. The eldest son was able, but died young. The second son was unfaithful and was disposed of, and the remaining two sons were even more incompetent. After successfully handling these families, Wu Zetian ascended the throne smoothly.