Korean screenwriters have a fascination with time travel for the past five years or so. Korean time travel stories are commonly taken seriously by fans as hard science where time travel mechanics should be explained. Alienoid (외계+인) is a time travel adventure that is easy to follow and is a mix of science fiction and fantasy.
The story is straightforward, Guard (가드), Thunder (천둥), and Lee An (이안) must capture or eliminate the criminal aliens who have successfully taken over their human prison. If these aliens acquire the divine knife they will be able to awaken their comrades and end humanity.
Time travel was also easy to follow, though they hinted there is more to time, it is pretty much linear in this movie. Time travel was only used as a literary device to trap the protagonists and the antagonists in late Goryeo Dynasty where magic and spiritual abilities were still practiced.
Anyone looking for a fun science fantasy adventure film, Alienoid (외계+인) is the answer.
I really made myself sad with watching Boys Over Flowers again. I mean why? Just why? The amount of times I wanted to scream at my screen. Hear me out... I have times I respected Gu Joon Pyo but please... I wanted some happiness for Yoon Ji Hoo.