i know this is a huge plot twist and he's a bad guy but i cant focus because HES SO SEXYY
im going to place bets that they're step siblings- one of them says "your father" and the other says "our father". still pseudo-incest, but hey.
That, since full incest is prohibited in kr manhwa industry or one of them isn't human or sth 'cause it's tagged as supernatural on mangaupdates and they've had cut off all contact from outside for 10 years.
i know this is a huge plot twist and he's a bad guy but i cant focus because HES SO SEXYY