Why couldn't Li Shimin complete the quest of the Legend of the Chinese Hero, the Tome of the Heavenly Book? Did he have to synthesize a Virtuous King Li Shimin to complete it?
My answer may not be accurate or comprehensive enough. There were many differences between the settings of novels such as the Legend of Chinese Heroes, the Book of Heavenly Books, and the Sage King Li Shimin and historical knowledge, so their plots and missions might not be consistent with historical facts. In novels, Li Shimin's mission was usually to show the protagonist's growth and leadership ability, so that the readers could feel the joy of victory. However, in reality, Li Shimin was the founding emperor of the Tang Dynasty. He established a powerful empire and implemented many important political and cultural reforms. He was an outstanding statesman and military strategist. His success was based on his wisdom and leadership. Therefore, in real life, Li Shimin's mission could not be completed because it did not conform to historical facts. But the plots in novels can inspire us to think and explore the spirit and abilities of historical figures and how to apply these values in reality.