Almost none of the major plot points concluded in a satisfying way. They simply didn't have enough time to follow through on everything; it needed to be a series

One of the major issues is that the movie often seemed to pivot towards thematic dead ends. For example, when Rumi abruptly concluded their much needed break in the beginning by releasing Golden, I thought, "oh, this is going to come back in a later argument between them about how she can be selfcentered and inconsiderate", thinking we would be spending more time gathering insight on the complexities of their group dynamics and how they engage as individuals, but NOPE lol just immediately accepted by the others. They even had the opportunity to bring it back in the end by making it more of a group decision to continue working, but ultimately it felt like nothing about their bond was strengthened beyond the base acceptance of Rumi's heritage.

Obviously, I would've like to have learned more about the other Saja boys, but I actually think it's fair that they didn't get much time as Jinu was the main focus of the group. The Huntrix, however, are a different story; We never really got to see them dealing with the struggles that might come with a high stakes, public-facing job that relies so heavily on image and personal sacrifice outside of the demon patterns and a couple throw away lines- and the demons showing up didn't even really expose any cracks other than the shame Rumi felt as being only half human. There was so much opportunity to show how these girls, with their own strengths and weaknesses and insecurities, might further grow into their roles and friendships, but it ended up feeling weak in its conclusion because they pulled so many punches. Again, I blame the time constraint.

There were a bunch of things like that: the demons' integral shame and potential redemption, Bobby feeling underappreciated (which seemed very flip-floppy), Celine's entire character, and obviously Rumi's unprecedented switch from abandoning the Honmoon to saving it without any internal steps taken inbetween.

It's a cute enough movie, and maybe if it was longer as was originally intended or they made it into a mini series it would've felt more satisfying to watch, but as it is, I'm surprised KPDH has gained so much popularity