Loved the chemistry of the two main leads, the support of their friends and family, and relatively believable portrayal of the environment. Storyline was simple, and had a natural progression. ML+FL support each other, recognizing that they each have their own lives/careers and can overcome obstacles together. One plausible misunderstanding that is resolved very reasonably and quickly. I particularly liked the phase between him knowing who she is and her admitting she knows (this is the only part I'm likely to rewatch).

They avoided most of the really annoying features of cDrama. For example, no accidental kisses or scary MIL. No weird evil characters undermining anyone. No stupid breakups. Playing the musical instruments mostly lined up with the soundtrack.

I liked PYOMS for similar reasons, and enjoyed the growth of Lin Yi (ML actor).

Dislikes
* Creepy SML -- actor is 23 years older than FL actress, and he looks even older than that.
* Boring second couple -- ShanShan's backstory took way too long to explore. Both characters very one-dimensional to the point it became annoying and I skipped most of their scenes. No chemistry either.
* Episode 28's hotel scene was completely out-of-line with characters and the main relationship story arc. ML+FL had been very comfortable to this point expressing feelings outloud. In this episode, they both drink to overcome nerves. She never drinks, and he'd never hide, so it was awful to watch.