I remember a bit of this novel. It’s very memorable to me because Bianca ended up being infertile. Thus Asel’s ship sunk to the deep sea because crown prince will not be allowed to marry a lady who incapable to conceive.
Ricardo on the other hand didn’t care and proposed to Bianca again even though they couldn’t have their own children. If his parents didn’t accept Bianca because of her infertility, then he’s ready to step down as heir to his younger brother.
That’s why I’m grudgingly okay with Ricardo as ML (● ̄(エ) ̄●)