Korean Hangul is from about the 15th C, but only really popular since the end of WWII Japanese occupation (started in 1905?).
It can be vertical, but that's maybe rare for ordinary books. Unlike Chinese and Japanese it's an alphabet.
Quote:
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As in traditional Chinese and Japanese writing, as well as many other texts in East Asia, Korean texts were traditionally written top to bottom, right to left, as is occasionally still the way for stylistic purposes. However, Korean is now typically written from left to right with spaces between words serving as dividers, unlike in Japanese and Chinese. Hangul is the official writing system throughout Korea, both North and South. It is a co-official writing system in the Yanbian Korean Autonomous Prefecture and Changbai Korean Autonomous County in Jilin Province, China. Hangul has also seen limited use in the Cia-Cia language.
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From
https://en.wikipedia.org/wiki/Hangul I'd imagine "stylistic purposes" = calligraphy & art.
I've watched an English language Korean TV service off and on for many years, Arriang TV.