The demon prince is a prince who cares for his royal appearance and fashion. He refers to himself as handsome and great. He urges the MC to refer to him with royal titles when first meeting. And, he comes off as over confident and lil spoilt at first, but actually is a caring person.
MC is a prince who goes to a normal high school on his request. Even though he doesn't want to always rely on his father, the king's power to get what he wants. He still comes off as arrogant, infuriated in how the ML talks to him, a prince with disrespect, not knowing his place.
ML eventually even nicknames him 'princess', hehe.
*webcomic is dropped, but complete novel is available on tapas
The a rich CEO's son is cocky and constantly kidnapped for ransom, to his irritation, he is now assigned a bodyguard who is none other than the former junior high classmate he used to pick on. And the bodyguard is only dealing with the MC's bratiness for the good money.
third couple
used to be one
Hero VS. Villain