Story: Definitely the best. I had fears that it might fail because it was based and adapted from a novel, however, the serious undertones and unique setting had made this one the standard of TH BL. It surpassed even that of Lovely Writer.
Acting: Superb acting. Add to that the chemistry between the two couples was palpable. It truly seems that Earth had met his soulmate. I wish to see them again in another series.
Music: I love how the OSTs were placed in each scene properly. And the song choices were heaven!