You definitely did NOT read it properly if you think that... They're not they just call eachother bro since they're very close and are LIKE brothers... (︶︿︶)＝凸
Theyre distant relatives
No they aren't. The Duke's parents died so the King took him into the palace as a ward because he was the heir to a high ranking noble family. They're from completely different lineages.
You also... Did NOT read it properly. If you're going to read a manhwa read it properly too or else you're just making yourself confused.
R they siblings? Honestly don’t answer if they are somehow related bc id rather pretend.