That stupid annoying crap that South Korean websites force users to enter when signing up for an account, whether it be for MMOs or other entertainment sites. This means consumption of those sites is strictly stuck in South Korea. The government forces this because they are very data sensitive and video game addiction is a major issue in the country.

This atrocity of humanity infamously encourages identity fraud where outsiders buy resident registration numbers in an attempt to get access to those sites. If you try doing so and you get caught, you can end up being fined $10,000 and sentenced to three years in prison.
Kyle: Hey, do you know any South Korean MMOs that don't require a resident registration number to play?
Chris: Well, most of Nexon's game's that are available worldwide don't.
by The Real Driller February 28, 2022
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