From Within: The Complete Series

Once in the nation of Xidan, a young boy was enslaved by a tyrannical emperor for his parents’ attempted coup. Punished for his parent’s deeds, he grows up craving revenge. Finally, comes his opportunity in the form of a yearly martial arts tournament that is hosted in the kingdom. The winner of the competition gets the chance to fight the emperor and earn whatever their heart desires. For young Xu, this is his only chance at revenge, and he will do whatever it takes to get it, even if it costs him his life.