Choi Dong-hoon is a popular director in Korea, having directed several blockbuster films. I encountered him when I saw "Woochi: The Demon Slayer," which is a hugely entertaining Korean historical fantasy film that stretches into the modern day with a wizard having fun and fights in a modern Korean city. This time out he decided to mix science fiction, fantasy (in the form of Daoist wizards again), time travel, and alien technology into an entertaining mess. With one caveat that I wish I'd known before I started the film: the Korean film title ends in "... Part 1" and the movie itself ends in a massive cliffhanger.

We're told that aliens have been trapping other evil aliens inside humans for centuries: this is a prison planet. Guard and Thunder are here to prevent break-outs. The story opens with Guard and Thunder fighting an escaped prisoner in 1380 AD ... and ending up with a human baby to raise because Thunder is a sentimental robot and Guard ... well, doesn't stop Thunder. And we also find out that the Crystal Knife they possess allows them to travel through time - which they do, to the modern day. It only gets weirder from there.

It should be noted that this is essentially an action-comedy: there are multiple comedy set-pieces, some of which retain their humour across cultures to North America. I really enjoyed the movie ... right up until it said "To be continued" at the end. Extremely annoying.