Although he was speaking in the third person, it was clear that the person—or rather, the corpse—he was referring to was herself!
"The Colin Family eventually learned everything, but they wouldn't feel sorry for this foolish heir for even a second, because not only did the idiot do something stupid, willingly becoming a tool in the hands of the Dragon Family, but also managed to bungle the whole affair. As for you, you can pretend you didn't know you were the Colin Family's illegitimate child at all, as if you've just crushed a vampire mercenary... In fact, if it weren't for that stupid heir telling you himself, you would have remained ignorant, wouldn't you?"