Don't understand most of the reviews....
Maybe sex, attraction, etc should be labeled...

The story is about Na Bi, who desires and feels sexual attraction for Jae Eon. She has lots of feelings for him. He only wants to have sex with her, at her apartment, without any other shared moments, while having other relationships with others.
Friends with benefits has to do with friendship and that is not the case. He doesn't care about her as well as the other girls...
Jealousy exists when someone thinks that owns the other. It is a feeling of possession. And that is why Park Jeon wants to be with her after she rejects him ..
She will agree, will be used by him but knowing that he will not changed and will hurt her.
So, it ends with a relationship where he will cheat on her and she will gladly endure! But the sex is good but even when they are together, as Kyu Hyun was saying, she will not be happy because their objectives and feelings are not the same..

And then a love triangle (what a refreshing plot!!!!!) With a childhood friend.
The other couples were way more interesting. They save this drama.

Don't like it. Not the sex part or the relationship when based in truth. He doesn't care about her and she is willing to bear with that. And the most interesting part is her friends, who knew that Park Jeon was awful and hurted and played with lots or girls, are trying to help them to be together...

Well...

Do you like a cheating man that looks good?
Do you like a woman who is treated as a good f...?
Do you enjoy a relationship that is Doom to end badly?
Then watch this drama!

If someone could edit only the story of the other couples this would be more interesting!