Because it is a romantic film, the characters in it are all imagined by themselves. Cheng in history is not such a romantic two-year-old child. According to historical records, Cheng's "Those who are less brave, make good use of Maguan" (Biography of Cheng Shu Zhijie in the Old Tang Dynasty) did not give up without a fight as described in the Romance. Although Li Yuanba and Yuwen Chengdou are among the best in The Romance of Sui and Tang Dynasties, there are no such figures in history. Harmony is the two heroes in Sui and Tang Dynasties! Therefore, it is obviously a myth to love to pick things up and dare not take responsibility.