I heard on a few YouTube travel videos that there are "stricter than normal" restrictions on where smoking is allowed in South Korea, especially in Seoul.
Are there any signs that I should watch out for to determine where smoking is allowed or not?
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Smoking 10 meters within bus station [in Gyeonggi-do], (10 meters within) subway station exit[in Seoul and Gyeonggi-do], any places with this sign, most public restrooms, 강남대로 [Gangnam Daero] in Seoul, all government-related buildings, restaurants, bus/train, medical facility, will result in KRW 100000 (about US$100) fine.
Basically, look for the sign, and avoid smoking in public if you are near subway station exit/bus station and in Gangnam.