Been a fan of hers for a while, I don't think she got her jaw shaved. If you check out her earlier dramas and her predebut pictures, her jawline hasn't changed very much. I think she has chin fillers, I think she fiddled with her nostrils, I think she did some stuff with her eyes.
She still looks quite similar to how she did when she debuted, and her looks have only improved tbh, so I think her surgeon did a good job. She used to be considered one of the prettiest actresses in korea haha, but then the Spy Myung Wol scandal happened and her image just didn't survive it :|