I'm guessing Jaekyung saw the group picture Heesung, Donggu, Dan and the staff took, confronted either Heesung or Donggu then will tell him where is Dan before hell break lose.
It’s 100% an illusion, no way he is actually there. I don’t think the author would do this
I just came back to reply and say 'I TOLD YOU'. Jaekyung saw the pic from Potato. Woohoo.
NOOOOOOOOOOO AHHHHHHHHHHHH
I'm guessing Jaekyung saw the group picture Heesung, Donggu, Dan and the staff took, confronted either Heesung or Donggu then will tell him where is Dan before hell break lose.