Unfortunately, Rugal is a drama that demands you turn off your brain and just go with the flow. I only finished this one because of the world pandemic (unable to go out) coupled with the convenience of airing on Netflix. Unless you're looking for a mindless action-fest, you'd be better off moving to better things.

PLOT: A Plot Hole Fest Served with Bad Writing
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The drama started with some promise, if not originality, but went downhill fast when it began to rely too much on action, eye candy, and special effects to make up for the writer's lack of experience and painfully simplistic narrative. The story really makes no sense and left no impression. Things happened because "reasons", twists were added because "why not?" and characters acted and reacting according to the "rule of cool" rather than logic.

If you are looking for a well-thought-out, or at the very least decent story, this is certainly not it.

CHARACTERS: Simplistic, Inconsistent and Unrelatable
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Rather than go through each character individually, I'll talk about them in general since none of them really stood out. One of the show's biggest flaw is the writer's inability to create complex characters. Consequently, they all feel borderline cartoony. Think shonen anime where the only focus of the writer is to pile love and adoration onto Gang Gi Bum (ML), who I'm almost certain became Do Hyun's (the writer's) self-insert (aka Gary Sue).

Gang Gi Bum quickly becomes the sole focus of the story, the strongest among all the Rugal members, adored by both allies and enemies... he is a walking plot-line -- or rather, a stumbling one. You can connect every story to him in an egotistical way which not only grew old fast, but allowed no room to develop any other characters.

Perhaps the biggest aggrievance of all was the disservice rendered towards the four female characters who appear on more than one episode of this drama --none of which were unfortunately fleshed out or given agency.

The two female "antagonists", for example, were useless. Argo's chairman's treatment was especially jarring. We were often told by other characters that she was cool, that she shouldn't be underestimated, that "you don't know what she's capable of" only to be shown... absolutely nothing. Again, the writer wanted to claim she's strong/cool/influential without actually giving her agency to show those things. And it's the same thing with Susan, the female scientist of the show. Where we're told by other characters all these things about her personality because she doesn't even have enough air time to develop her...

Of course, the most inconsistent was poor Song Mi Na, the lone female member of Rugal. She went from being the second-best of the team to become the weakest link; complete with a few badass in distress scenes --which were promptly excused by the writer though characters exchanging comments regarding "how strong she is" and how "impressed they were with her". In so doing, the Do Hyun created a laughable cop-out for only showing her distress and having all her badassery apparently happen off-screen...

At the end of the day, the lack of depth the entire cast of characters was riddled with meant I couldn't connect, relate, or even care for any of them. I was never rooting for them to succeed. I was also unconcern whenever they were "in danger". They were wrapped in such a thick layer of plot armor, that it stood to reason they would come out victorious in the end. Heck, even the characters seem keenly aware of their plot armor (especially the ML) because they never displayed an ounce of fear, which marks an author as lacking experience and the confidence of putting his beloved characters through the grinder.

Which leads us to the next point.

WRITING: Amature. Tell, why show?
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I could tell right away the writer didn't have experience because he relied a lot on exposition. Meaning he spoon-fed the audience the story through character dialogues rather than having us reach the conclusion he wanted through scene development.

A good writer will show, rather than tell. If he wants us to feel bad for a character, he'll dedicate time to showing how the character suffers rather than having him say "I'm so sad" in a short conversation. Although the process of showing will be longer, the result will be more powerful.

Simply put, if the audience is not moved to tears when a character cries on the screen... then the emotional buildup wasn't done correctly. In this case, telling us what the characters were feeling through dialogues resulted in a sense of disbelief and disconnect, which made me unable to empathize with any of them.

OVERALL [TL;DR]
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Learn from my painful experience and skip this one if you're looking for a good show. The writing is atrocious, the fights grew old fast, the plot is messy and inconsistent, the characters lack complexity... In fact, the only thing Rugal has going for it was the eye candy, which suffered when they went full emo style with the ML. But even these leather-clad men aren't worth muscling through the diary of a fourteen-year-old who self-inserted into a fantasy where he's the center of the universe; men want to be his sidekicks, women want to bed him, enemies fall in love with him and everything happens based only on the "rule of cool".