Renowned calligrapher Lee Sang-hyun puts on a performance to mark the 577th Hangul Day in front of the statue of King Sejong at Gwanghwamun Square in Jongno District, central Seoul, on Monday. King Sejong (1397-1450) created the Korean alphabet system known as hangul. To mark this national day, which falls each year on Oct. 9, central and local governments held a series of events, including a large-scale ceremony in Sejong City featuring an air show. [NEWS1]

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