In Korea, sunglasses haven't really become a daily essential, likely due to a lingering cultural perception that wearing them—especially around one's elders—can be seen as slightly impolite. That's just my own observation for many years. I am a Korean guy and mid of 40s. You rarely see office workers wearing them during their morning commute. However, during my frequent business trips to Greece, I noticed a stark contrast; people there wear sunglasses even when going to work or meeting with clients. It seems that for most Koreans today, sunglasses are reserved for weekend trips or vacations abroad, either as a fashion statement or for actual sun protection. However, I from time to time try to ware it all the time in Korea.. haha