the last sentence from Chen PP to Emperor put me in blank: the Emperor doesn't know that FX is his child?
he knows, in season1 when emperor + his two sons and FX have dinner together, and FX reluctant because "this dinner for family only" and the emperor simply said" nah you got thick skinned , its alright" LOL he knows they're all family there.
btw> I would like FX and DuoDuo is a couple even off the record :p
ML marry wan er, but he has other wives, he has a child with qi emperor.