dicksbro,

Yessir!. Here is the current, interesting marriage law in South Korea.

Marriage may not be allowed between parties whose relationship of blood relative exists within the eighth degree (including the blood relatives for the real-adopted child kept before real-adoption).

Marriage may not be allowed between parties if either of them is or was the spouse of blood relative within the sixth degree of relationship, or if either of them is or was the blood relatives within sixth degree of relationship of the spouse, or if either of them is or was the spouse of blood relatives by affinity within fourth degree of relationship of the spouse.

Marriage may not be allowed between parties whose relationship of blood relative existed within the sixth degree of adoptive parents lineage and within the fourth degree of adoptive parents affinity

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Eudaimonia