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'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.