If you loved Alienoid: Return to the Future, try Woochi: The Demon Slayer
A bridge between a film you've already seen and one most people haven't. Woochi: The Demon Slayer has roughly 5.8× fewer votes than Alienoid: Return to the Future — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Choi Dong-hoon, and they sit in Action / Adventure / Fantasy territory. If that's the register that drew you to Alienoid: Return to the Future, the second film will land in a comparable space — through a different lens.
What Woochi: The Demon Slayer is
Here's a movie about a pipe. A mischievous Taoist wizard imprisoned for centuries suddenly finds himself tasked with saving humanity from demons. The fate of the world may depend on his mastery of Taoist magic, or it may just depend on the pipe. It's really about the pipe, though.
Ask 
ChatGPT
Claude
Grok
Le Chat
Perplexity
for a deeper bridge
ChatGPTClaudeGrokLe ChatPerplexity