Responses
I mean considering how Woojung treats Sarang (outright assaulting him too. Had Jinwoo not taken the punch, Sarang could have been seriously hurt since he doesn't appear to do physical exercise), I wouldn't be surprised that Jinwoo quickly fell out of love with Woojung.
I personally would not date someone who abuses(? Correct word usage?) their younger sibling even though their younger sibling had done nothing wrong.
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so hes was in love with woojung and drops him that fast? hes not really tied up in twins when he didnt even fight against sarang at all.