This drama is exceptional and very intense.
Story: Nothing we haven't seen before. It was good in its own way
Characters:
FL: The drama is from FL's POV, how she broke the stereotype and went back to try out what she always dreamed of, to avoid any regret in the future. Love a strong FL. Very straightforward most of the time, she daringly confronted the ML on many occasions instead of backing away, not doing so might lead to more angst and misunderstandings. She didn't go the route of 'I love him, even though I'm hurting so much and should always understand him', she tried her best to be happy, but when it came to a point she found she was not happy she openly words her fears and insecurities straight on instead of bottling up, which i found very satisfying. In this era, we have to voice out good or bad with the people we love to make them understand how they make us feel. She has her insecurities with her music and love life in the middle, but she turned out strong in the end. Didn't take shit from ML or anyone else. Of course, they get back together but I liked how she prioritized herself first after all the pain she went thru and said "enough, I don't want to deal with ur shit anymore". PEB nailed it!! she was spot on in every scene, you can literally see the emotions in her expressions.

ML: Very complex character. A guy who is confused and couldn't set his priorities straight. Understandable at the beginning of the drama coz he is struggling with his hidden feelings for the SFL, but not after he admitted he likes the FL and they start dating. Didn't want to share things with FL even though he knew it might hurt her and lead to misunderstandings. Hated it when he ignored her and lied multiple times unless the FL confronted him. Agree he is kind of a person who bottles up/ not share his probs but not at the cost of hurting the person he loves the most which he claims is the FL. He is not a bad person but just a conflicted person. Sure there would be a few mistakes we make in a relationship that too being an introverted person he is but wish he got over a few things first and then took the big step. Drama has shown how much pain and torment the FL has gone thru coz of him, I would've been satisfied if he had gone thru same pain, sure there was some at the end but felt it was nothing compared to other party.
But overall nice acting. KMJ managed to convey his emotions well most of the time.

SML is the sad puppy of the show, his acting touched the spots.
SFL is not the typical evil B. sure she tried to sabotage the ML's relationship once or twice, but not to the extent of being evil.
OST is good enough for a drama that is set in the music world.