South Korea SIM paperwork: laissez-faire or strict?

Looking for information from someone who's recently visited Korea as a tourist.
With regards to visitors buying a SIM card for local use, I've noticed some countries are totally laissez-faire. You just hand over some cash and get a SIM, like buying a chocolate bar. Nobody asks or cares about your name or anything else.
In contrast, other countries have high paperwork and identification requirements.
(I guess the most extreme is countries like India, where SIMs are highly controlled and foreigners can't get a SIM.)
What is the situation in South Korea? Surely a traveller here has visited lately???
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Which Sims are used in South Korea?
These are the network frequencies used by SK Telecom and KT Olleh, the two providers which offer tourist SIM cards in South Korea: 4G LTE Bands: Band 1(2100MHz), Band 3(1800MHz), Band 5(850MHz), Band 8(900MHz)Which SIM card is best in South Korea?
Best Korean SIM CardSIM Card1 Day Cost10 DaysTrazy5900\u20a933,000\u20a9KKday5900\u20a934,650\u20a9KoreaTravelEasy$6$32KoreaSIM (Orange)\u2013$31.905 more rows•Jun 13, 2022Does South Korea have unlimited data?
| Korea SIM Cards powered by SK Telecom and kt(Korea Telecom) network are a Authentic and Reliable Company, that provide the best communication solution in Korea for your personal, local and international communication with unlimited data provided by 4G LTE Prepaid SIM, eSIM and WiFi EGG.Do Koreans have SIM cards?
The most convenient and easiest way to buy a SIM Card is to buy it online in advance. To buy it offline, you can purchase it at Incheon Airport or outlets run by Korean mobile service providers: KT, SKT, LG U+. Major convenience stores, such as GS25, CU, Seven Eleven, also provide SIM cards.Customs/Immigration in South Korea UPDATED (Fall 2021) | New K-ETA entrance form, snacks \u0026 SIM card
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Images: Aleksandar Pasaric, Markus Winkler, Harry Cunningham @harry.digital, Aleksandar Pasaric