I really enjoyed the concept and the scenario, it is quite innovative and leave for sure a lasting impression on the viewer. I did not found the story super well-paced and the ending felt a bit too rushed though. I think the movie could have been a bit longer to better flesh out the ending and the message of the film.

The ensemble cast was pretty good. More specifically, I really enjoyed Rain performance, with his goofy, cool but also more crazy and mad sides. Im Soo Jung did also a great job in her very particular and erratic role. It is a bit of a shame that despite the quite good acting, I did not find myself emotionally invested in the characters. It might be linked to the script, but I felt more like a "cold" external observer trying to understand what was happening rather than candidly rooting for any of the protagonists.

I quite enjoyed the directing choices to represent the various mental illnesses faced in the mental hospital. There are quite a bit of memorable scenes and the cinematography for some of them was really cool. Even so, the visual FX regarding some of the cyborg aspects did not age very well, it is still impactful for sure but a bit cringy at the same time. The music did not really stand out to me, except one specific song with some yodelling.

I would recommend this to people that enjoy movies by acclaimed director Park Chan Wook. It is not the most well-known of his filmography but it is worth a watch for its interesting concept. Strangely enough, even though both pieces are very different from another, it made me think somewhat to "Squid Game" as a comparable recommendation.