Earth is doomed. A large asteroid is heading straight for the life-filled planet and the nations of the world are left scrambling to deflect or destroy the incoming disaster. Just 100 days separate Earth from planetary extinction, if not annihilation. When ICBMs are proven to be ineffective against the asteroid, all hope seems lost.

However, a mysterious, artificial portal is discovered by Korean authorities in the central parts of the Republic of Korea (South Korea) just months before "D-Day." The portal is located after it brings a man from the past into the future; a man that claims that the current year is the 20th year of the Wanli Emperor's reign... which was back in 1592. While 2022 Korea is in chaos due to the asteroid crisis, 1592 Korea is in a crisis of its own, dealing with a full-blown Japanese invasion of the Korean Peninsula that will eventually lead to a million Koreans dead and the entire nation in ruins...

As the Korean government recognizes that the gateway is the only way to save its nation and the future of the planet, it quickly pools its resources to build up a forward base in 1592 Korea and take over the entirety of Joseon. Thus, transferring as many modern Koreans into the past to rebuild and reform Joseon, ensure Korea's prosperity and independence, and deal with the asteroid that will come in 2022 (that is 430 years away from the year 1592).

However, things are not as easy as it seems. In the modern world, various nations start to take note of the massive amount of resources and manpower being devoted to an insignificant rural region in the middle of South Korea. The world's leading powers begin to suspect that something is not right with the small Asian nation, including South Korea's closest ally: the United States. North Korea continues to threaten its southern counterpart as the mystery grows bigger, while the People's Republic of China plots to join in on the fray once the true nature of South Korea's "project" is revealed. Meanwhile, in 1592 Korea, the modern Koreans must deal with restructuring an entire "primitive" nation. Joseon is completely unfamiliar with republicanism and is filled with slaves and traitorous nobles. Not only that, but the Joseon people's faith in the government has been shaken after the Joseon King's flight from Hanyang (Joseon's capital) due to the Japanese invasion, leaving the Republic of Korea to pick up the pieces...