I'll start from what I like about this drama.
The beginning was really good. Typical boy best friend had feelings for the girl but she doesn't like him back... it's sad but really cute.
I also like the scenes where there guys were fighting over her I felt it was really funny.
And the confession scene is nice to despite the fact that I don't really like the drama, I'll give that scene an 8/10 I probably watched it like 4 times.

Now let's talk about the Buts in this drama. Why on earth would she change her entire path in life for a boy... could never be me.
I feel that's a very stupid decision.
Also can we talk about how she failed almost through out high school and somehow manages to get to Medicine deportment in university...how is that possible?
So you are telling me she wasn't smart in high school and somehow during the period of preparing for college entrance exam she's learns all the things she missed in high school because some smart student is tutoring her... that's not how real like works.
People that excel start working early, they don't just study at the eleventh hour with some so called motivation because they want to get into their crush's dream school.

And don't even get me started on their university and post university life. Honestly I skipped about 7 episodes and just read the summary online, the drama got annoying at some point.

Overall, I didn't really like the drama, it's really unrealistic