Right now it's the K-dramas The Greatest Love and Romance Town. I don't think The Greatest Love needs me to clumsily praise it---being a Hong Sisters rom-com is enough for it to speak for itself.
But Romance Town. SO GOOD! I went in thinking it was going to be your typical Cinderella story, and while there certainly is an element of that, the Cinderella aspect doesn't come from some kind-hearted, love-blind chaebol, but from the luck of winning the lottery. Romance Town does a great job of fleshing out both the maids and the chaebols in a way that really makes them well-rounded: each character has both their faults and their good points, so we don't get that annoying extreme dualism of rich/evil vs. poor/good. Well, except for maybe Joo Won, who's being posed right now as the female rival, but she's portrayed as just your ordinary, oblivious rich girl, not as a mindless spite machine that so many female rivals devolve into. I don't know--this one just has the right amount of humor, tenderness, and mystery for me, and the plot is moving speedily along, which I also love about this show.
Except [POSSIBLE SPOILER ALERT] now that they've introduced a mistaken identity plot point, I'm a bit worried. If they resolve it by the end of the next episode, I'll be so happy, because then we get Gun Woo's world rocked a bit, and hopefully some further romantic development. If they drag this out, there will be a HUGE frown on my face. [END OF POSSIBLE SPOILER]