Actually both are mediocre compared to a "Accidentally in Love" or "Extra-ordinary you" . That being said both had enjoyable moments just far and in between.

Comparison:
1. K drama had better looking ML and 2nd Lead
2. ML in K drama is more likeable start to finish. C-drama had boy with abandonment issues hard to like
3. FL, both ultra cute but K version had way too many over exaggerated faces
4. 2nd Lead. C drama had a way too old looking one for HS actor but personality/lines wise he had funnier ones. K drama 2nd lead just felt like the standard sweet cute guy forever in the friend zone
5. Teachers in K drama were more likeable
6. FL leads parents were more likeable in K drama version
7. Song dances in K drama were cute

I mean it's just ok both versions. Something play on the side.