Transmigrated as a 'Good-for-Nothing' Emperor

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You know Yang Jian, right? The henpecked one. A history professor who also happens to be surnamed Yang was exploring a tomb when he suddenly transmigrated back to the Sui dynasty and became its founding emperor.

Yang Jian thought, "Good thing I've never even been in a relationship, and I know my history. What if I change history like this? That would be bad, right?"

It was also fortunate that the historical Yang Jian was known for vowing, "I will have no children by another woman." The professor from the twenty-first century thought that was pretty great.