Jaekyung knows that Dan is a very empathetic person and takes responsibility for others more than for himself. He figured that if he said something in a moment like this, Dan would only take responsibility out of obligation and not out of reciprocity. Besides, he sees himself as the cause of the bad things that have happened to Dan, so the best thing is to let him go. Maybe with time, he can win Dan's heart for who he is and not because of any kind of obligation Dan feels towards him.
Jaekyung knows that Dan is a very empathetic person and takes responsibility for others more than for himself. He figured that if he said something in a moment like this, Dan would only take responsibility out of obligation and not out of reciprocity. Besides, he sees himself as the cause of the bad things that have happened to Dan, so the best thing is to let him go. Maybe with time, he can win Dan's heart for who he is and not because of any kind of obligation Dan feels towards him.