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.
류준열
as Muruk
김우빈
as Guard / Thunder
김태리
as Ean
소지섭
as Moon Do-seok
염정아
as Madam Black
조우진
as Mr. Blue
김의성
as Jajang / Doctor
이하늬
as Min Gaelin
신정근
as Right Paw
이시훈
as Left Paw
김대명
as Thunder (voice)
최유리
as Young Ean
