Now that u mentioned it.... his hair is slowly turning brown Σ( ￣□￣||)!!?
I just went back to compare the cover page for earlier chap to currently chap. And in earlier chap 1 page his hair was black and then now currently the chap 1 page is brown??!!!!
I think the artist must've been too tired and forgot about it or didn't read the story themselves and didn't know they were supposed to change it back.
Well his and Cai's hair have been fluctuating from black, black brown, and brown the entire time. Maybe the author decided they actually liked him having a consistent lighter shade after seeing it? Or the sheer light in that room is so bright that his hair is radiating.
Did the crown prince forget to change his hair back after visiting the orphanage incognito?