Pyo Wol is an orphan. when he was young Pyo Wol is kidnapped and locked in a dark cellar with only one meal a day. And after surviving various obstacles, he became a full-fledged assassin. and while he was out on a mission He was betrayed by his kidnapper. So he took his revenge and was chased. He was thrown into a pit full of snakes. Seven years later, he finally came out of the pit full of venomous snakes and began his revenge once more.