I liked this drama a lot, because it was refreshing, cute and funny. Actors have a good chemistry. For me it was a little bit similar to "Go go squid", but I liked both dramas, so I recommend to watch "Falling in to your smile". ?
For ost I don't liked that much, because it was not catchy, maybe I liked only the ost that was sang by main couple actors.
I liked to rewatch cute dramas, so maybe in the future I would like to rewatch and this drama, but I think not everybody will want to rewatch this drama.