This probably is the most toxic drama that I have ever watched and hopefully I will never have to do that again.
To me the drama just conveys the wrong morals and message:
"The bad boy who is playing with the innocent girl and she accepts it."
While i loved the character development between the side characters like Yoon Sol and Seo Ji Wan, who go through their troubles with communication of their feelings and honesty, the relationship between Na Bi and Jae Eon is way too obsessive and well... toxic!
The scene of Na Bi and her ex in front of her house after he he heard she was dating again was my favorite one, because it showed the strength and dominance of the female lead right there. BUT her just accepting in the end, that Jae Eon will hurt her and make her feel not worth it destroys that whole picture of that strong woman, which is really sad.

To me Nevertheless missed a lot of development between the lead couple and just Jae Eon individually. If we had a lot more evolution in his character and some more depth in his past or personal challenges for him to overcome this might have been a drama liked. Maybe more smaller situations where Jae Eon actually is reflecting about his behavior and actual understanding of Na Bis emotions.

Even though the acting was well done and then music well made, I definitely wouldn't recommend cuz of all the mentioned factors.
Was pretty much disappointing :/