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Weeaboomer created a topic of Checkmate(TAN)

Maybe it’s because i binge read this while being tired, but for me I never realized when Soohyun‘s acts for revenge turned into acts of affection. Like at what point does he get feelings for Eunsung. I might have looked over some points, because at the end of the story it’s clear they love eachother, but the development leading up to this point was vague for me.. Can anyone explain?