Sageuk: Roleplay In Joseon is Five Powers/Harmony Drive engine storytelling game about historical dramas in the Joseon period (1392-1897.)
The PDF is 61 pages, with large, very readable type and some great art.
It's also very user-friendly. If you're familiar with Korean dramas but not trpgs, or with trpgs but not Korean dramas, there's sections dedicated to getting you up to speed. Likewise, you're not expected to be an expert on the Joseon period. Plenty of info is provided (as well as a lot of mentions of Joseon period dramas you could 'research,' if you're of a mind to look up Kingdom or Dae Jang Geum,) and the writing is clear and excellent.
Gameplay-wise, Sageuk feels very structural. There's a session 0, a built-in safety checklist, and the overall feeling is one of cooperatively building a story rather than reacting to the choices of a single storyteller. So this isn't a game that you play to see if you'll win. It's a game you play to get into (and out of) trouble.
Furthermore, Sageuk is designed for long-form gaming. It expects you to play a campaign, not a one-shot, and it takes advantage of this by having players set Aspirations for their characters in advance. Each Story Arc focuses on a particular PC, with the rest of the cast supporting that PC or providing B-plots, and each Story Arc has hooks for a few Aspirations. This campaign-oriented approach can take a long time to resolve, but it definitely ensures that everyone gets time in the spotlight. It also guarantees a fairly strong hook, as each Arc connects directly to at least one character's desires.
Character creation is lightly crunchy, which surprised me, and it allows you to put points into Approaches, Skills, Abilities, Drives, and more. There are also Professions, which serve as loose classes, giving you a grouping of starting Skills. Both Professions and Skills are numerous, and they all come with an extremely helpful historical writeup, plus several suggestions for how to play them. Similarly, characters receive Backgrounds, which come with even more historical context and a choice of two Abilities.
The core dice rules are explained at the very back of the book---so some game terms will be introduced before the reader understands them---but with that said, they're pretty easy to understand. You roll a Yang pool (based on skills, stats, and advantages in the story) vs a Yin pool (based on your opposition.) Then you cancel out dice from the two pools according to a chart until only a few dice remain. If you have as many remaining Yang as Yin, or more Yang than Yin, you succeed.
Taken as a whole, Sageuk feels very stable and well constructed. It provides its players with a lot of resources, but it doesn't overload or ask too much of them. Historical context is always there for players who need it. The core dice are relatively simple. And there's enough texture to character creation that you feel like you're building something durable. The only element the might be missing is a starter scenario, for groups who aren't comfortable enough with the Joseon drama genre to put one together from scratch.
Overall, if you like storytelling rpgs, and if you enjoy (or might become interested in) Joseon historical dramas, I would strongly recommend giving this a shot.
Minor Issues:
-Page 14, "All that maters" matters
-Page 24, Art references a "skill advantage." Is this the same as adding 1 Yang die?