@ANIMETIME51 Bc in earlier chaps it was hinted at as well as in chap idr it was revealed that he was A by the lady invigilator (forgother name sry ( Ĭ ^ Ĭ ) )
@Lan zhan it was revealed that he was an old invigilator from back when they used the alphabet letters for each of them. He was invilgator A and knew Qin Jiu but they both had a mission or some accident i can't remember exactly what but it lead both of them to forget each other.