In the 13th century, Sangjeong Gogeum Yemun was published. What historical milestone did it mark?

Many believe that Guttenberg created the first metal movable type printing press in the 15th century. But Korea was at it nearly 200 years earlier. Choe Yun-ui created the manuscript, Sangjeong Yemun – the first to incorporate movable metal type – which was published in the 13th century.

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