Though I am a fan of JCW, I could not rate any higher than 7. It is nice to watch, probably because it's musical and helps to make the watch pleasant. Somehow, it just feel that something is missing and story not complete or fulfilled. The story seems to be too heavy on Ah Yi and lesser on the 2 MLs and the back story for II Deung is pretty minimal. Even for Ri Eul, I was waiting so long to see his back story in his younger days that made him like that... It only came in the last episode with like less than 10 minutes about his middle school life, so it is quite disappointing to see that. Though screen time may be similar for JCW and Choi Sung Eun but it looks like Ah Yi is the key character in this story with Ri Eul and II Deung as supporting. So, in terms of story plot, it is definitely lacking for JCW and II Deung.
Re-watch value: not for me. But the songs are nice, I can always go to Spotify to listen to the songs.