Possible Answers This Weekend???? - Tumblr Posts

It's pretty obvious to me that it's jimin especially because of the yellow balloon hahaha i know it's from the serendipity mv

I can see it. Jimin is definitely a favourite.

Jimin and JK are top guesses, right from the beginning. People have also assumed Jhope. All are totally understandable. Once you find the hint trail within the story itself, it's hard not to see it.