The achievement of King Sejong that people don't really know about

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A formal report came up during Sejong's time.

The content was about Muslims who came to Joseon soil, settled down and lived there,

but since Islam, then as now, is a religion that constantly causes filthy trouble (kkojang),

especially during marriage ceremonies, one of the most important human events, they refused to wear Joseon wedding attire and tried to hold weddings in their own clothes,

so the other side (the Joseon spouse/family) was ashamed and didn't want to get married.

And that while we held Neo-Confucianism as our state religion, these guys kept doing weird prayers.

The report was sent up to the King.

Sejong saw this and said, 'Got it.'

After that, Islam completely vanished from Joseon.

Reference: Annals of the Joseon Dynasty, King Sejong, 9th year, April 4th entry.