As much as this drama got promoted, I wasn't expeciting anything groundbreaking. The premise is simple and school setting is nothing new.

The story hits all the expected spots and is well-paced. However it ends up being a victim to common webdrama tropes and cliche. The leads' acting was decent enough to overlook how cheesy this whole thing is. At the same time it's a shame such well-produced drama with actual budget is just another forgettable fare.
The story it bit juvenile, there isn't really much of character developement. Apart from second male lead everyone retains their high school attitude and carries it into their adult life. The 'current time' plot seemed to be underdeveloped, as if it was an afterthought.
The male lead did a good job acting, and I was looking forward to see him after his role in 'Single & Ready to Mingle'. Female lead's acting is okay, especially given it's her first acting I don't have much complaints. The chemistry between them was bit lacking though.

OST is full of known names. The songs are actually good and suit the webdrama. The sheer amount of songs made it seem like it was OST for 16eps drama. The music is one big plus this drama has, even though the whole "school band" theme is somewhat under-developed.

Overall, it's a barely average drama. It might cheer you up on a rainy day but won't change your life. It's an easy watch with a decent production value, but overall it's nothing to write home about.