Hmmm...if you truly paid attention to this chapter, you can clearly see that Jaekyung looked so concern when Dan felt nauseous during dinner time and messaged him right away asking him to come to his room.. probably to give him some medicine or something to make him feel better.. I want to believe that he has changed for the better... my gut is telling me that Dan must have fallen asleep and dreamt all of these. The whole smut scene felt abrupt to me and very contradicting to the character progress JK has been showing from the previous chapters. I'm an optimist so there we go
You could be right because I wasn't expecting Jaekyung to ask Kim Dan for sex before the match as part of his usual jinx especially after he told Dan that he doesn't feel nervous like every time before his matches, it even felt not right for the author to do a sex scene in this situation but also Dan's internal dialog doesn't seem like he's dreaming I'm not sure.

I’m sure af that this is just Kim Dan’s imagination… the sequence of events felt rushed and out of nowhere. I have high hopes that this is just Kim Dan assuming that this is what Jaekyung wants when he messaged him to come to his room…so he must have imagined these scenarios in his head.