I watched this in my first few months (maybe a year and a half ago?) of discovering asian dramas and I loved it. I tried to rewatch it a few months ago and I couldn't. I think I'll try again but my standards have increased and I definitely won't enjoy it as much.
Well, it does have pretty high ratings. But some dramas are just not your cup of tea. Like, for me, as I said, I'm not the biggest fan of this drama, but I loved Tale of the Nine Tailed. It's just personal preference.