The Joseon period (14th-19th C) of Korea's their formative period, but a big blind spot for most Westerners. I know a fair amount about the ancient Mediterranean thru fall of Rome, and the Dark Ages thru Charlemagne; some Japanese and Chinese history because of chanbara and kung fu movies and books like Outlaws of the Water Margin; some American history, but not so much the Texas School Board approved bullshit; only the most cursory details outside those time/space bubbles. Even tho it's right on the border, and like Japan was heavily influenced by China, Korea's isolation and outright weirdness keeps it in the dark. What I've managed to learn is: They tried very hard to be strict Confucians, they recorded everything (seems like half their upper class existed to spy on the other half), and they treated women and lower classes like animal property, worse than China or Japan which were hardly egalitarian.
What I'm learning from this show is: A) Their architecture's so Chinese the Chinese look like they're the bad copies, B) They have fantastic hats and rather nice machete swords, and C) Their aristocracy are shit at covering up zombie outbreaks.
The Crown Prince tries to find out if his sick father is alive or dead, in the hands of a wicked, pregnant stepmother half his age. Yeah, this is gonna end well. Happily, he has a fat but competent Sancho Panza sidekick and sets off on an epic quest.
Hanyang, where they start, is the equivalent of Seoul today; Dongnae's a southern port. The show explains none of this, be ready to read a lot of wiki pages to get at least some geography and fact-checking.
The peasantry might as well be Dennis the Shrubber from Monty Python & the Holy Grail, they're charmingly filthy and stinky.
The dead here are like Chinese jiangshi mixed with Return of the Living Dead zombies and a bit of 28 Days Later rage-infected. They're bestial, awkward, and stupid, but not slow or incapable of cunning.
And there's a lot of Evil Dead comedy in the fighting and zombie-eye camera in some scenes. The little zombie children are adoraterrible.
As in any good zombie story, the living are the worse threat.
This is a very gameable series. It's just like my old Dungeons & Zombies campaign, with wandering knights/fools with swords fighting undead or trying to find shelter every night.