Alienoid: Return to the Future — Characters & Cast

To get back to the future and stop the escape of an alien prisoner locked in a human body — and, beneath that, to reassemble the family time scattered.

Sent from 2022 back to 1391 as a child, she grows up inside the past she was exiled to, becoming a gunfighter with a reputation across Goryeo and a target on her back. Her arc in the sequel is the long labour of return: retrieving the Divine Sword, locating the android Thunder and forcing the gate of time open, while learning that the era she was stranded in gave her the people worth fighting for.

Initially reward and reputation; increasingly, protecting Lee Ahn and discovering the truth of what is inside him.

A Taoist swordsman-for-hire whose bravado outstrips his ability, Mureuk moves from comic opportunist to genuine ally. The sequel destabilises him from within: a weird presence in his body disturbs him and makes him a suspect to his own world, forcing him to confront the possibility that he is not entirely himself.

To maintain the containment system across centuries — and to keep the child he was never designed to raise alive.

The nanotech android tasked with supervising alien convicts imprisoned in human bodies, split across a human-facing persona and the vehicle-form intelligence Thunder. His arc turns programmed custodianship into something indistinguishable from love, as the mission to contain prisoners collides with the duty of care he has developed toward Lee Ahn.

To understand what she saw and expose the truth behind the deaths caused by the detonated haava.

An ordinary person in the present day who accidentally witnesses an alien event and refuses to let it go. Her investigation into the haava deaths turns her from bystander into the modern timeline's engine, stitching the contemporary thread to the Goryeo one.

To expose and destroy the alien she believes is concealed in Mureuk, and to claim the divine sword before rival factions do.

One of the two mages of Samgaksan, she begins as a pursuer convinced that an alien lies hidden within Mureuk, and her certainty drives much of the middle-act chase. Her partnership with Cheong-woon provides the film's comic ballast, and her adversarial stance gradually reorients as the true threat clarifies.