The door of time opens between the swordsman who wants to seize the legendary divine sword at the end of the Goryeo Dynasty and those who chase after an alien prisoner imprisoned in a human body in 2022.
Gurus in the late Goryeo dynasty try to obtain a fabled, holy sword, and humans in 2022 hunt down an alien prisoner that is locked in a human's body. The two parties cross paths when a time-traveling portal opens up.