NO SPOILER: This is good watch, intense plot, twists and turns, not so great production value (it's old), revenge story, ML good guy, fights against SML bad guy, nothing we haven't seen, but really good watch.
Main thing what makes this Drama special and really original is SML, he and his story is really different from any character that I've seen (though I love anti heroes, not good guys, revenge stories and dramas with dark vibes). Also FL she is different too, and her story isn't what you can expect too.
so maybe there are lots of dramas with best production value or best acting, even more interesting, but this one has characters and plot lines, like no other, so at list you never forget them. unless if you like standard melodramas and dramas with strong line between good/bad white/black hero/antihero - you will like it...


SPOILERS:
as I said SML and FL are really different, their stories and how they end up isn't what you expect. yes there are dramas where FL chooses SML but I can remember maximum 1-2 drama where this chosen SML is bad guy/anti hero, but I can't remember any dramas where anti hero hasn't redemption/regrets but doesn't looses anyway (doesn't looses in battle with hero, doesn't dies, goes to jail, gets the girl). In this drama every single character are against SML but he wins anyway, he is really strong and smart. I loved that he didn't changed, writers didn't made him "see the truth and become good, or want to answer for his sins", he is realistic character... FL is realistic too, she knows that isn't angel and doesn't tries to be angel, life is hard and she wants make it easy, and many helps with it always - this is true. also she likes that coldhearted not good person SML, he is handsome successful rich smart guy, who wouldn't like him )))