August 618 AD. The four prison doors in Chang'an City were opened. As a minister, Li Shimin led his brothers to arrest prisoners on death row overnight. Li Jiancheng, Li Yuanji and He Ruolan showed up. The two colluded with the Lingnan He family and wanted to get rid of Li Shimin. Li Yufeng showed up to save Li Shimin. All of this is Li Shimin's plan to instigate a mysterious case of divine punishment.

In the fourth year of Wude, Li Yuan came out of the palace to "invite the divine general". On the way, he was robbed and killed by Jianghu people. In order to protect Li Yuan and Li Shimin, Li Yufeng peeled off the cocoon along the way, investigated the murderer in the crisis, and uncovered the seven dead soldiers of the Celestial Dynasty hidden among the people one by one. The secret of man.