Kingdom of Goguryeo, ancient Korea, 645. The ruthless Emperor Taizong of Tang invades the country and leads his armies towards the capital, achieving one victory after another, but on his way is the stronghold of Ansi, protected by General Yang Man-chu, who will do everything possible to stop the invasion, even if his troops are outnumbered by thousands of enemies.

Tae-hun causes trouble for the his unit with his antics. He does not take much seriously until a dogfight leaves a pilot dead and another missing. Tae-hun and the other members of his unit launch a rescue mission to prevent a war from breaking out.