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Minami is working at the planning department of Minami Furniture. One day, Suzaka, his kouhai during...
at first the cheating trope was never a thing for me, but it turned out his fiancée was forced too, which made it a bit less worse.
since it was an old manga, i wasn't surprised that people went along with the idea that someone hating or treating you poorly meant they liked you. Hope this helps.
i’m glad that nowadays fewer characters like that exist