Sergeant Jeong Cheol-min leads a diligent squad stationed in a windowless, refurbished storage room. Their reputation for hard work is unmatched until counselor Hong Yeong-soo enters the scene. Determined to mold Hong Yeong-soo into a fitting addition for the squad and the military's needs, Jeong Cheol-min faces the challenge of integrating the reluctant private into their environment, leading to unexpected turmoil.