Dean Johnson, a top assassin, is reborn in ancient times as a condemned prisoner. He activates a Kill-to-Grow System and rises through the army. After killing exploiters for the people, he is targeted by the court. He fakes defection and teams up with General Cherry Yeats to infiltrate the Nomads. At the feast, he assassinates the enemy chief and achieves great military success. Framed by the foolish emperor, he overthrows the tyrant and becomes an invincible legend.