At first, the show had so much potential because of the age difference and the boss-employee relationship, which could have attracted the public since there aren't that many dramas with such theme. But then the plot didn't really advance and it took about a whole 8 episodes for him to confess and be rejected. And then the reason for rejection wasn't clear, and suddenly he liked him and everything was good. It could have ended there, but no, they created another problem which made absolutely no sense and magically got solved after 2 years of no communication, when they met again. On the other hand there was the secondary couple, that recieved no screen time, was inconclusive and left out.
I think the show still deserved a 7 overall rating because it was kinda entertaining, kisses were good and would be good to watch if you are bored, but again it was really frustrating, and the main couple did not have much chemistry.