During the whole drama, I could not predict ANYTHING. Especially with who Jojo will end up with. So I highly recommend watching it, it's worth it. The romance is a bit cliché, but overall, it's kinda of different from what I usual expect from a romance drama.
Concerning the actors, I LOVED them all. They are ALL perfect. The music was really good too, but I wish there was more different songs. I know that some people didn't like the flashbacks in the drama, they thought that it was useless and that it was becoming annoying, but for me, I didn't mind them.