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.

Eun-ha, who is a normal junkyard employee, secretly works as a delivery clerk that deals with unusual delivery requests. One day, Eun-ha heads to Seoul to pick up a client who is involved in a gambling crime that wants to flee overseas. However, Eun-ha meets the client's young son at the pick-up point, instead of the client himself. Kyeong-pil, a current police officer who is actually masterminding the whole gambling crime, chases after the missing child who has the security key to the bank account that holds 30 million dollars.