Responses
Yup absolutely. Plus she's taking out her insecurities on Haesoo because in her mindset, if she'll confront minshit then she would have to entertain the idea that minshit is truly lacking, barely doing the bare minimum AND still hung up on his ex. It will open a can of worms for her and her immature ego can't handle it, so it's a lot easier for her to lash out on the ex.

While Ari IS being used by Mincheol, she is definitely naive and being a very shitty person to Na Haesu because Ari is insecure and not able to trust Mincheol. Ari taking out her insecurities and anger on Na Haesu is unacceptable. And, Ari thinking she’s better just because she’s younger is ridiculous. Yes, a lot of guys prefer younger girls, that doesn’t make it the be-all end-all of self worth/value. Taeha showing how Na Haesu also has a wealthy, younger partner should give Ari a slice of humble-pie. Uppity little girl that she is.