I think the story presentation in this film is what the drama version was shaping up to be before the entire thing fell apart (although obviously expanded and more fleshed out in the drama).

The movie does a good job of hitting a lot of the major points of the story and making them all flow together and make sense in relation to each other, but I do have to wonder about something. If I had watched this without reading any of the webtoon or watching any of the drama, would I have actually understood what was happening? I'm not sure I would. While as I said, they do a good job of making things make sense in relation to each other, they don't do as good of a job making sure it all makes sense as a whole so that the audience actually understands what's going on. The storytelling style reads a little slice-of-life but in a way that is somewhat confusing to follow at times.

I also have to be honest and say that I don't think the cast here is as good as the cast in the Kdrama (even including Park Hae Jin; his character just feels different in this movie, not nearly as sinister and mysterious as the Kdrama version, and I'm honestly more impressed with his portrayal in the Kdrama), but they definitely all still do a good job, and I didn't hate any of their performances.

As for the ending, probably one of the most important aspects of the movie since the drama ended so terribly and the webtoon author was forced to change her ending because of it so we'll never actually see how she originally intended it to end, I don't think it's really the direction the story Deserved to go in, but at this point, I'll allow it. I think everyone deserved a happy ending after having to put up with the mess that ended up being the drama.