It seems I have an unpopular opinion regarding this kdrama. I really enjoyed it!
The chemistry between the two main leads and the hyperrealism was great to see. It isn't your typical soft, fluffy romance. If that is what you are looking for you will like the relationship between the lesbian side couple (who are adorable) or boycott the show completely.
I read the webtoon after finishing the drama adaption and I have to say I didn't like it, it was very choppy, and felt like the story wasn't really going anywhere. It was then abruptly ended with a rushed, thrown-together ending (I believe the author had a certain reason to cut it short).
In the webtoon the ML is very one-dimensional and although he is 'nice' to girls he has a coldness in his eyes throughout the story. In the drama Song Kang did a great job at portraying the aloofness of Park Jae Eon, he also portrayed a lot of emotion with his eyes. which wasn't seen in the webtoon, and even when Park Jae Eon would act a certain way you could see the emotion in his eyes of how he really felt but wouldn't acknowledge or be honest with Na Bit about.
In the webtoon the FL is assertive, she starts a consensual sexual relationship with a man and when he crosses the line she moves on to someone else. In the drama Han So Hee portrayed Yoo Na Bi as assertive at times but also composed. She starts a consensual sexual relationship with a man she is attracted to, it isn't until other people start to find out that she feels what can only be described as shame for her actions.
Having a consensual adult sexual relationship is not 'toxic'. I've seen a lot of people throwing this word around when describing this kdrama. If you want to have consensual casual sex with one person or multiple people that is not toxic, as long as those within that relationship understand that it is casual sex. Which, within this drama is understood by both Park Jae Eon and Yoo Na Bi when starting their friends with benefits relationship.
Getting personal here, I had a casual relationship similar to the leads in this show when I was in my early twenties. Unfortunately, it didn't work out, like most casual relationships but that's just reality. Who watches a fictional kdrama that doesn't end on a happy note?
If the drama adaption had ended the way the webtoon did it would have been abrupt, perplexing, and gone against the direction of the drama. It also would have been unwarranted for potato boy, as he deserved better than someone who had feelings for someone else.
I would have liked to see the drama carry on a little to see some insight into what a relationship between the leads would be like but unfortunately, you don't see if Na Bi gets to go to Paris or if Park Jae Eon takes the scholarship in America. I guess it's left up to the imagination how their relationship progresses or fails, following their middle finger to society's standards when they decided to continue their relationship despite what other people's opinions on it were.