I'm agreeing with jeanie, and going with The Greatest Love as well. I've only seen two other Hong Sisters dramas (Gumiho and YAB), and only a few episodes of another (Hong Gil Dong), but I'm going to cockily go with Greatest Love anyway. So far, Greatest Love has skillfully avoided the pitfall that almost ruined Gumiho and YAB for me: the second half spiral downward into melodramatic angst. Yes, there's some angst in Greatest Love, but this angst feels more mature and less hysterical. The tears that I've cried while watching Greatest Love came from being genuinely moved by the story and the characters, not manipulated and wrung out of me as was the case with the other two I've seen. In that sense, the Greatest Love just feels real. I'll get around eventually to watching the rest of their dramas---until then, the Greatest Love it is.