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There are many kinds of hanbok worn by Koreans. There are various kinds, including the Goryeo Dynasty and the Three Kingdoms period, as well as the Joseon Dynasty, which people know a lot.

This is a historical fantasy drama, so it's hard to tell the exact time.

If you are interested in Korean historical dramas, I recommend you to watch Hwarang, too. It is a drama written based on real history. You can check 'Shilla' clothes.