There is an advertising technique called subliminal advertisement that works even if a specific screen passes quickly enough to be recognized by humans.
Will this really work?
I heard that it is not possible in Korea, but is there a case in foreign countries that it actually worked?
365 2017-07-04 Gentleman
https://ko.wikipedia.org/wiki/%EC%84%9C%EB%B8%8C%E...
Based on what's on the wiki here, I don't think there's a country that's allowed yet.
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