this artist has a case of same face syndrome

Not particularly? I mean I won't lie to you, there's no intensely creative and distinctive character design going on here, but compared to other manhwas in this genre, it's doing really well. The characters have different face shapes, eye shapes, noses and build, not to mention that this is one of the few manhwas that depict acne. I'm not going to praise it too much, as the ugly characters are all evil or untrustworthy, which I'm not a fan of, but it really isn't doing that badly.