I got the idea that they were childhood friends?? Where did you read they were siblings?
They are NOT siblings by blood. It's just similar to how, in Korea, they call younger men "dongsaeng" which could be a form of "lil bro" but not in a related-by-blood kind of way.
Probs when FL was calling the guy brother, which is understandably kind of easy to be misunderstood ig; especially with the translation kinda wonky, it'll be hard for people who don't have english as their first language.
Didn’t realize how few chapters there were until I got to the end :/. Still, this looks interesting! Tbh, I find it kinda weird how the brother is acting—hoping he doesn’t have a weird sister complex, or worse, becomes a love interest or something. Anyway, I wonder if the other CEO could lie to her while he’s in dog form, or would he get a human head since he already has a dog one? Looking forward to seeing how this story develops!