As someone who has read the webtoon before watching the kdrama, I felt that story-wise, they dramatised the story a bit too much as the addition of some of the new components and twists in the story occasionally made me feel like the story was a bit too much at times, and the middle episodes felt somewhat dry. However, with the plot twist in the later episodes, I felt myself getting hooked again into the plot as the FL explores her previous life, so personally I feel that this drama started strong, went a bit weak, then ended on a strong foot.
The casting for the actors were perfect in my opinion as Hye-Sun portrayed the devious, extraverted FL perfectly, and same with Bo-Hyun in his role as a somewhat brooding, proud ML.
The OSTs for this drama were an absolute bop, I'd recommend "Down (Juicy Juicy)" by Jo Yuri, "Star" by Colde, "Here With Me" by Doyoung, and "Secret" by YELO.
As much as the drama was nice, these are probably one of the dramas that I'd watch once and then leave it sitting on my list because as much as I felt it was nice, it wasn't great enough to hook me in that much to rewatch it.