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.

Cast

Ryu Jun-yeolMuruk

Kim Woo-binGuard / Thunder

Kim Tae-riEan

So Ji-subMoon Do-seok

Yum Jung-ahMadam Black