King Sejong and the 5/5/10 rule

King Sejong is the most innovative king of Chosun dynasty, who pioneered a number of practical creations such as Hangeul, Korean alphabets. King Sejong was a hard-working man. He was under a very tight schedule, so-called “5/5/10” rule, spending 5 hours for sleep, 5 hours for study, and 10 hours for work. That way he was able to achieve so many great things even if he had such a big job to run his kingdom.

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