Deputy Division Commander (Colonel): He assists the Division Commander and is prepared to act as a proxy in case of an emergency. He is close to the protagonist. A graduate of the Korea Military Academy and a member of the Reconstruction Society, he possesses strong intelligence-gathering capabilities.

Administrative Support Officer (Colonel): She oversees all daily operations, including the Division Commander's schedule, protocol, and report preparation. She is close to the protagonist. An ace who rose to this position incredibly fast in her mid-twenties, she reached this rank despite being a woman. She secretly harbors feelings for the protagonist. While not a member of the Reconstruction Society, she is one of its collaborators.

Corps Commander: His role involves operational command and control, overseeing operations, training, and combat readiness for subordinate divisions and units during both wartime and peacetime. He and the protagonist are like brothers. Having graduated from the Military Academy together, they are close. In public, the protagonist maintains strict military discipline toward Kim Eun-woo as a superior, but in private, he calls him 'Hyung.' Kim Eun-woo is criticized by those around him for lacking decisiveness. He is not a member of the Reconstruction Society but serves as its patron and godfather.