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.
Ryu Jun-yeol
Muruk
Kim Woo-bin
Guard / Thunder
Kim Tae-ri
Ean
So Ji-sub
Moon Do-seok
Yum Jung-ah
Madam Black
Jo Woo-jin
Mr. Blue
Kim Eui-sung
Jajang / Doctor
Lee Hanee
Min Gaelin
