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Hangul is the Korean alphabet invented in 1443 by King Sejong the Great to combat the problem of illiteracy. It was designed purposefully to be easy to learn. It is often touted as one of the world's most logical writing systems. Sejong explained that he created the new script because the existing idu system, based on Chinese characters, was not a good fit for the Korean language and were so difficult that only privileged male aristocrats (yangban) could afford the time and education to learn to read and write fluently.