Wushen Waizhuan: Fei Sha

An 8 year old child, along with his brother, managed to escape from the disasters of an army's merciless killings! His own past, how much could people possibly know? His own heart, who could possibly understand? These questions was the "revenge-mindset" that has lingered the brothers through extensive training to become insanely powerful in the martial-arts. Now, this same 8 year old child has grown into an adult and is now a King! He is the Leader of the Southern Barbarian Sect. He is known as the southern barbarian, SANDSTORM..!!

(Source: MangaToshokan)