@Terry Dextar Yes I agree. JaekYung also knows that Dan has been honest with him, he's just bothered by the pictures of Dan meeting that older guy. And also the key thing that JaekYung asked was " You can't even do that right?" Meaning he knows that Dan probably didn't do it on purpose. He's doubting Dan but yes that's better than outright accusing without letting Dan talk.
And BL shall live on