How is it, that Korea is so international famous for it's K-Pop, but while I just cannot stand most of the KPOP music (sorry, taste is personal), the K-Dramas have really good music. Why do they not let a real band like CrudePlay or Mush&Co debut and make them international? They do have the industry cut out for this.

The FL has an amazing voice! So high and clear, combined with a music, that emphazices her, you do not hear that often!
The songs, the ML produces really stay in your head.

What brings me to the story being ~ dependend on your personal liking. It probably is just an easy plot to go along. Typical triangle, but the FL decided long before the two MLs. There is a rivalry between the MLs on two topics: producing and playing bass. Both of them are a prodigy in one each, so it is quite balanced.
Rewatch value is relatively high, not only for the music, but also because I could better understand inner struggles and proper meaning of the words at a rewatch. But I did not rewatch it for that, there are better dramas out there.

The acting and quality is as high as one is used to in K-Dramas. Which is a compliment. One can easily immerse in the story, without always thinking, something does not feel right (except for parts of the storyline itself)