Responses
I regret to inform you that 1. They are (they're on the cover together) and 2. Thars never stopped manga before
If there is only one dude on the cover its usually the ML. And seeing that in the tags it says historical, it would be normal(?) ( it wouldn't be that big of a scandal). Since there was a lot of weird stuff that happen back in the day.
OK i am on chapter 3 so guys don't give me spoiler but still just tell me that yustav isn't the ml cuz even though they don't share any blood they still are officially step siblings and it would be weird for me if they up together