I really enjoyed the story concept-- plenty of drama and detective/mystery content, a little romance, and a little supernatural. I also enjoyed our main characters (444 and Ha Ram) and thought the dynamic was decent, though as per usual I wanted more of their unique relationship...but it's also not strictly a romance sooo ¯\_(ツ)_/¯

My biggest issue was identified pretty early on, which was the over-complication of the plot, which made following the story arduous at times and then just plain frustrating. I don't mind thick plots, or even thiccc ones, but this was way too all over the place for my taste. My second complaint is about the ending, and I'm not sure if this is a valid argument or if it's just my personal taste BUT I always feel cheated when dealing with time gaps at the end. In this case we get all that build-up in the last two episodes, very fast-paced, action and clue-catching, we're finally putting the puzzle together and I'm getting excited for either a tragic ending that begs for a sequel or a bittersweet one that tugs on the heart strings. Instead, we choose to erase all memory of 444/Han Moo Gang/Kim Joon, fast-forward literal decades to when Ha Ram is ancient and now dying and THEN we die happily ever after...meh :/

Essentially, I think the writers could have taken a different route, left the door open for a sequel, and rounded out the romance/mystery/supernatural aspects, which I think would have bumped up the ratings. But they didn't, and I still enjoyed everything on a whole, and would definitely recommend this drama....but probably wouldn't watch it again.