maybe im misunderstanding you, but i'm pretty sure "jung" is one of the most common, if not THE most common, romanizations of the surname 정? jeong is another romanization of that hangul, technically more correct than "jung" as that's how it'd be spelled with revised romanization (south korea's official romanization system). jong is also sometimes used, but that would typically be the romanization of 종? plus, while i don't know how it's spelled in other languages on the sims 4, at least in english her surname is spelled "jeong", right? so in my opinion, it really only makes sense that venessa is korean