I watch Korean Version first.. And think it is amazing.. But when i watched the japanase version, i think japanese version is better..

The Story.. -> If korean dramas usually have 16 - 20 epsiode of drama. japan dramas just have half of them (around 8 - 10 drama). Because of it, japan version has more focus than korean version. Korean drama will divide the drama to 4 episodes for each phase, so korean drama will make a setup in 3 episodes and make the summary in episode 4. but japan version has solid setup and summary of each episode..

The character or acting -> i like the main character from korean version.. but in japanese version. i almost love all of them. i dont find any single character that i feel to villainy in this drama.. yeah, sometimes they make a bad decision, but i can understand it..

The Music -> Japanese music is amazing and unique.. thats why they add J in any genres in japan (J-pop, J-rock, J-metal). its not because it created in japan, but it because japan has their own style and their own scale in music.. and the kid that got sick in his throat and dont wanna sing anymore so another kid sing a song for him, i think its one of my favorite scenes..

Rewatch value -> when i feel amazed because of korean version,, i cry for each episode in japanese version.. its cool, its warm, its shoot in the right place..

overall -> i will give 10/10 for this drama.. even if i skip many scenes in this drama, it still feel good.. it prove that this drama is very good..