No Smoking Sign in Korean - 성동구

This no smoking sign is from Seongdong district (성동구),

and it explains why you shouldn't smoke in the area.

The sign says 담배연기 싫어요! 간접흡연으로 이웃들이 괴로움을 호소하고 있습니다, and

• 담배: cigarette
• 연기: smoke
• ~ 싫어요: don't like ~, the basic form of 싫어요 is 싫다(not to like, to hate)
• 담배연기 싫어요: We don't like cigarette smoke
• 간접: indirect
• 흡연: smoking
• ~으로: due to ~ 
• 이웃: neighbor
• 들: plural suffix
• 이: a subject marking particle
• 괴로움: suffering
• 을: an object marking particle
• ~ 호소하고 있습니다: from 호소하다 (to appeal, to complain) --> all together it means '(people) are complaining of ~.'
• 간접흡연으로 이웃들이 괴로움을 호소하고 있습니다.: Due to secondhand smoking people are complaining that they are suffering.
• 성동구[Seongdong-gu]: a name of district in Seoul

I like this sign because it sounds polite and also more appealing.

More traditional no smoking sign usually says '금연,' '금연구역,' or '흡연금지.'