The Heaven-Chosen Ninth Prince

I'm already a good-for-nothing, and you still want me dead? One minute you're making me marry three widows, the next you're trying to marry me off to the female God of War of the Wu Dynasty, and then you're sending me to an enemy kingdom as a hostage! Do you people even realize I'm no longer the clueless Ninth Prince I used to be? If this is fate, then I'll come clean: I transmigrated here from the body of a God of War. Bring on whatever tricks you've got. We'll settle who's stronger, and who's going to die!