Seo In Guk, as always, truly special. I especially enjoyed his progression into maturity when he was dropped into the work place. Lee Ha Na's character was older than him, but she was very immature, so they worked together. the physical comedy was wonderful. I loved all the various friendships at work, at school, and at home. My favorite scene of the whole show was when he left school and found her waiting for him outside the gate. Sigh...so romantic. I downgraded the show only for the ending. Once they decided to get married the whole thing became a big old mess.