Jay was the one who realized it first, and then I wasn't mentioned anymore if I remember correctly Aryatetsu
I think in my memory the fact that he realized that Jay is director yoon is blurred to him realizing he's the guy from 5 years ago I'm really bad with remembering
I swear it was revealed before that he already realized it's him from 5 years ago!!!! Did I get it wrong?!! Shall I re-read this!!