Travel Through Time and Become Li Shimin's Awakening System to Unify the World?

[Historical imagination + ancient times + history + system + hegemony] One second, I was a high school history teacher teaching the history of the prosperous Tang Dynasty on the podium; The next second, I became Li Shimin, and the awakening system in my mind only gave me one rule - to unify the world, I can return. Really or fake, me? Li Shimin? Unify the world?