sunoo and you hated eachother, and in all honesty, your marriage with him was fully forced. you both only could agree for the sake of your parents' company. you guys were forced to be a couple, forced to be with your enemy. enduring the irritation of this whole situation, the only thing you guys could do was obey your parents.
today is a holiday, meaning you guys had no meetings, interviews, and no paper work. your parents wanted you and sunoo to get along with eachother, so this marriage wouldn't be a problem. even though your parents knew that he was your rival your whole life, it was for the company, for the money, and for the good life of you.
you saw sunoo in a casual outfit, while you were heading downstairs for food. you were confused why he was all dressed up in the afternoon when there was no work today. "im going to visit my girlfriend." girlfriend?? what the hell? he could get caught by the stalkers or random strangers. this would completely ruin their reputation as a married couple, people would think that he was 'cheating' on you.