The story takes place in the "Burning Earth Alliance", a fictional country on the Eurasian continent in the new era. The Invincible Six were temporarily recruited under the new security bureau to deal with border crises, black market armed forces, terrorist attacks and coup conspiracies. The team members each have their own characteristics, complain and support each other, complete impossible tasks amidst laughter and tears, and gradually grow into true military heroes. In the flames of war, youth and blood blend, brotherhood, hatred of country and family, and personal dreams collide with each other. Humor runs throughout, with ups and downs, all the way to the final resolution of the war. In the end, the team's mission was completed, and the six people went their separate ways, promising to each other: be proud on the battlefield and reunite in the next life.
