The Iron Inside

Love and survival beneath the sand.
Baekgi awakens in a world engulfed in sand after being cryogenically frozen. She joins Spear and Shield, a unit entrusted with protecting the bunker, and begins training under her senior officer, Ibaek. They must fight to survive in this new world amidst sudden epidemics and monster attacks...

(Source: Manta)

Note: Includes one extra chapter.