Responses
I don't know what jinx you read but it was stated that Jaekyung started developing feelings for Dan in season 1. Like the first comment said, he didn't have time to process those feelings and now that he finally has himself to his thoughts, he’s started to react weird and he's getting confused about the sudden thoughts and images about Dan. There's no guilt tripping here.
I wish authors could stop guilt tripping Seme into falling in love after few chapters. JK made it obvious he wasn’t into Kim Dan like that. Dan fell in love, big deal. JK was never in love like that for it to lead to him being severely emotional after Dan left. It was purely sexual, no love. You can disagree below.