It's not monologuing that weighs down "Gyeonseong Creature" as much as it "dialoguing".

There's some very credible attributes of this drama and it deserves some accolades. The photography is terrific. The pyrotechnics and slow-motion shots are stunning. There's a few low light scenes in the countryside that are jawdropping. The score is solid. The wardrobing, at least to this layman's level of expertise, is exquisite.

There's some solid supporting characters and actors . Jo Han Chul, in particular, is as good here as he has ever been. There's several great actors that just don't have the character depth unfortunately though. The talents of Im Ki Hong, Im Chul Soo and Ok Ja Yeon are almost completely wasted. For the villainry, Kim Su Hyun and Hyun Bong Sik and Choi Young Joon all play extremely terrible and awful monsters. But then there's a lengthy list of other wrongdoers and each time one of them absorbs any of the focus, it detracts from developing the main antagonists.

And there's plenty of bloat all around. Kim Hae Sook is listed as a lead but there's no need for the character to appear at all. Wi Ha Joon disappears for vast stretches and when he is visible, is bland and forgettable.

As for the leads, when given the opportunity to showcase their strengths, they deliver. Han So Hee and Park Seo Joon deliver in the action set pieces and exhibit all the grim resolve a viewer can handle when things get dark. Sadly, these moments aren't enough.

While the structure of the show is compelling, the ground-level narrative is twisted so badly with unnecessary side- and back-tracks, incomprehensible gaps in plausibility (the ventilation shaft that literally holds an entire squadron of soldiers is particularly laughable), interminable stretches where the highlight of the program, The Creature, is forgotten and, egad, the dialogue! The production team apparently thought nothing of stopping gunfights and melees and action to have some of the most saccharine and cliche and dull exchanges between characters. Of what had most likely been hundreds of pages of script, they needed to be reordered on a wholesale basis and almost every line rewritten. This was a concept that begged for a brief backstory up front and then a deep and long and uninterrupted dive in to a suffocating, claustrophobic, dark and forbidding place. Instead, "Gyeonseong Creature" is a tedious mess.