Humanity's greatest minds collaborated to create the "Moon Shield" plan upon the arrival of an asteroid that could have obliterated Earth. Rockets were launched to shatter the asteroid while the Moon would divert any remaining debris from the planet. Unfortunately, the plan fell just short of success as a tiny piece of the asteroid struck Earth. Moon Yoo, a researcher stuck on the Moon, witnessed the world's demise.
Rather than being driven to self-destruction, Moon decides to make use of his time last person alive. Moon has every resource needed to survive and ample time to explore the enormous lunar base. Little does he know that the area holds many secrets, and he may not be as solo as he had initially believed.
