 If you liked
Omniscient Reader's Viewpoint
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 ...then you might like
Viral Hit
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Both are manhwa in which the MC is the only one who's read or seen important information that no-one else has read (or at least not everyone has read further than a certain point in the case of ORV). This info proves extremely useful when an issue suddenly pops up for the MC.
<>Omniscient Reader is adventure and fantasy, Viral Hit has more rough fights and is about delinquents in the school environment.