I loved everything about this series. The way Moo wins flirts with Kang and the way Kang slowly accepts his feelings. Yes, there are two(!) episodes that will break you and the ending could have been a bit sweeter, but all in all you will finish it happily.
I started this series for the story and I stayed for the music. Keen (Moo) can really sing (in my opinion). And the lyrics are just so beautiful!
Considering the cast and their acting: I knew Milk only from 23.5 when I started Only Boo and I really loved her as Neth. And for KeenSea and AunAshi: I have nothing to complain about.
I really liked this series and I think, if you need a beautiful love story and still need to cry a bit; this Only Boo is definitely the right choice