Question

Why did people rebel against the Sui rule?

Answer 1

---------- Heavy taxes and forced labor led to massive revolts and a brief civil war. Yuwen Huaji, Emperor Yang's counsellor, killed him in 618. --------

That should help.

Answer 2

There was a lot of discontent about the loss of life, the forced labor, and the heavy taxes. Heavy taxation and compulsory labor duties caused widespread revolts and a brief civil war. Emperor Yang was assassinated in 618 by his adviser, Yuwen Huaji.