In 2005, North and South Korea jointly produced the nuclear weapon "Flying Thunder Bomb", but under pressure from international powers, South Korea and North Korea had to hand over nuclear weapons, and the desire for national prosperity was once again in vain. North Korean Major Jiang Minji (played by Kim Seung-woo) was unwilling to surrender and kidnapped Dr. Jin (played by Kong Xiaozhen) who participated in the project and the flying thunder bomb. The South Korean side sent Major Park Zhengyu (played by Huang Zhengmin) to lead the pursuit. Just when the two sides met, a comet passed through the sky. Jiang, Park and others were affected by the powerful force of the comet and came to North Korea in 1572 through distorted time and space... Jiang, Park and others happened to deter the Jurchens who were slaughtering Koreans, and were regarded as "heavenly troops" by the Korean ancestors. That night, a thief stole their weapons, and this thief turned out to be the Korean national hero-Yi Sun-sin (played by Park Joong-hoon). At this time, Li Shunchen failed the military exam and lost all hope. Facing the frustrated national hero and the ancestors who were bullied by the Jurchens, the soldiers of South Korea and North Korea, who traveled through time and space, began to fight for their respective beliefs...