Newtonian physics may not bind the Laws of Drama Writing, but it is a helpful starting point for examining “Bulgasal: Immortal Souls”. Newton’s first law states that a body that is at rest or is in motion at a constant speed in a straight line will remain at rest or continue at the constant speed in a straight line unless it is acted upon by a force. In other words, for something to change, we need some sort of object or mechanism to trigger a chance in action.

With the drama in question, we begin with events that occurred 600 years ago which is where we find our object moving forward. To summarize, Goryeo era monster hunting ace Dan Hwal became a bulgasal (an immortal monster which feeds on human blood) and he loses his family. He sets out to wreak revenge against those who put him in his predicament. We flash forward to present with Hwal seeking Sang Un, once a bulgasal, now a human, reincarnated. Every other character of any note is a reincarnation of someone or something other creature from hundreds of years ago. As the storyline progresses, Hwal and Sang Un encounter Ok Eul Tae, an antagonist from the origins of the story.

Let’s set the storyline aside for other matters…

The production is outstanding. Whether it was set design, photography, soundtrack or the physical monsters themselves, this crew was tops. The monsters are exceptional. Whether the settings are the Goryeo era forests or present day mountains, the settings are gorgeous. The special effects are above average. There is not a copious amount of OST but the few entries are solid. And there’s more than one underwater sequence that are some of the highlight scenes.

There’s some fine acting too. Park Myung Shin is the standout as a Goryeo era shaman and present day aunt/butcher for Hwal. Lee Joon creates a compelling and vibrant character for the twisted and scheming Eul Tae. Han Seo Jin plays a young Sang Un and continues to create one of the most impressive filmographies of any young actor anywhere.

It’s a mixed bag for the leads. Lee Jin Wook as Dan Hwal has the imposing stature and gravelly voice to pull off a character that is part dark monster and part former human bent on retaining some of his humanity. But the character has shortcomings that no actor could really work around. He’s smart enough to clandestinely coordinate a complex manhunt and amass a significant collection of assets but has lived hundreds of years learning almost nothing. He follows a predictable cycle where he is introduced to a new side to his backstory, he refuses to believe it then just decides that it must be true. And despite the fact that he wants to end his troubles, he’s got the worst sense of self-awareness on the planet. He’s supposed to be the hero, albeit a non-traditional type of one, but he’s so determined to derail any effort to make progress that he’s nearly impossible to sympathize with.

As for Kwon Na Ra’s Sang Un, she’s got enough sense to diagnose Hwal’s issues, can formulate a basic plan and know that she needs to invest in and maintain relationships. That’s all good but the direction for the character was to overwhelm everything else about the character with a damsel-in-distress aesthetic. Even when her actions should signal strength and determination, the visuals instead emphasize her weakness and impending panic. That’s the present day visuals. Have to recognize that her appearance in the historical eras is simply stunning.

Without spoiling too much, there’s no end to this saga unless there’s an end to Eul Tae or Hwal or Sang Un. But two aren’t easy to kill and the other one will just reincarnate so something out of the ordinary has to happen to end this.

Here’s where Newton comes in. We have this trio that has been on the same path for six hundred years with this seemingly unsolvable problem. What would have made for an outstanding drama is that at some point of the storyline, the viewers are given some somewhat comprehensive understanding of how our object in motion at a constant rate of speed in a straight line was put in said motion at said constant rate of speed in said straight line. Then the production could have adequately built up over multiple episodes to a climax where new big force is brought forward to bring about the cataclysmic change in motion and to put an end (or new beginning) to our heroes and villains story.

Instead, a full reveal of the real origin story only happens far, far, FAR! too late leaving little time to build any appropriate amount of tension for the climactic showdown. Pending the full reveal, Eul Tae is left as a likely evildoer but possibly ambiguous character which fatally hamstrings his actions. Instead of going full dark and crazy, there’s only glimpses of his true nature. To keep a semblance of mystery about him going, he winds up a disappointing antagonist who spends too much time politicking with Hwal and plotting in the background than being, y’know, a bloodthirsty and invincible monster. And instead of Hwal and Sang Un spending far too much time wondering how they ended up this way, they could have been doing something much more interesting like, y’know, fighting monsters.

It’s a tremendous shame because the scenario was promising. There’s lots of interesting monsters and the show was terrifically entertaining when there was action. But it is invested so heavily in a painfully slow reveal of backstory and keeping the main characters and viewers in the dark that the characters are unable to develop. And, y’know, move forward in a new direction.