Romeru
I might be nitpicking but I think that is whiting and he knows dark day is Riley. Firstly in the chapter that Riley asked if he could go to the academy the only one who didn't react was white king, second he allowed his son to date his teacher for 'emotional support '. Lastly you can't tell me that the prophet didn't tell him how evil Riley is when he adopted him. One last thing... Whiteking is potraid "too stupid when it comes to his family "while there are that kind of characters most of what I have seen they hold the most cunningness and mysterious backgrounds than most