I can understand the after hand disappointment but it depends on the person or the occasion like they were both in the mood for it and spoiler ahead, if you don’t want a spoiler don’t read this
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jaeyoung knows exactly what he’s planning and as we already know how he can be a moron sometimes XD he’s trying to mess with him in a cute way cause he knows how much sangwoo can be a perfectionist
I used to fond of jaeyoung making sangwoo stressful, but him joking around about such serious, well-prepared, not to mention EXPENSIVE plan, pisses me off. He knows himself his boyfriend is a cheapskate, any normal human with empathy would take it seriously when a cheapskate person suddenly showed up in an expensive suit, expensive car, and made reservation on luxurious hotel. Instead he joked on the proposal, joked on the music sangwoo chose for the violin performance, kept seducing him and couldn't keep it in his pants. If he doesn't respect sangwoo that much, at least he should try to respect the money sangwoo spent for his plan. It doesn't take a perfectionist to feel worst when their long time special plan got ruined like this

I’m on the spectrum, I hate when I miss something I scheduled it gives me such anxiety and throws me off the rest of the day