I don't know if Koreans just have very low standards for dancing or what, but her "freestyling" is pretty cringe, and honestly just really bad.. she seems to just default to an attempt at waacking (while doing it flat out awful), she definitely stop trying to twerk if she doesn't know how, and I don't know why she keeps mouthing the lyrics.. that's like what kids do when they first learn to dance.
There are many, many great dancers in Kpop. But spontaneous "freestyle" is a LOT different than dancing to a pre-choreographed routine that you've practiced hundreds of times in the studio. I think their ability to freestyle shows that Chungha and Lisa from Blackpink are the most talented dancers in Kpop
It's the American in her. You won't see Koreans dance they way she does, all sexy & provocative because of the uptight & conservative Asian culture. That's Chunghas advantage.