I got contradictive/opposite/convoluted tough after this :
● Few Chapters earlier, Melfina/Godess mentioned 'DemonKing' is a Reincarnator
● Viktor mentioned Sera sealed so she is safe & could be the next demon king
● But Sera Already exist when his father/Demon King at that time still Alive
● Viktor lied to MC he wants to eat Sera so he could become next demon king (dunno about other demons thought)
# Conclusion so far :
● Logic behind this DemonKing Successor kinda messed up, or
● New DemonKing will suddenly popped up outta nowhere in the future (cz he/she is a reincarnator)