A drama that never gets old to me is one with an irresistible re-watchable quality. One that I not only can re-watch but want to re-watch.
I have watched Queen Seondeok so many times. Almost as soon as I had finished the drama, I watched it over with my sister. And re-watched it myself, lol. I guess I’m just a sucker for boss princesses and loyal bodyguards. And Kim Nam-Gil as a tortured warrior.
My second choice would be Protect the Boss. It’s very rare that I re-watch an entire drama over again; but I have seen this one all the way through twice. And loved it just as much the second time around.