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It really depends

I have found that Starcraft always works.
Manga, I have notice them rad are the usual: One PIece, Bleach, Hitman Reborn, Death Note ( all of these have well-known animes)

you might also try some the webtoons (webcomics), which are prolific on Naver
i suggest: Noblesse, TAL, Superior Day, etc

if not, just walk past them casually when they r on break, most will b online reading/watching something on their smartphones

Thanks I'll check these out!