20 episodes was a little too long. Maybe it wouldn't have dragged so much if they'd made it the usual 16 episodes. Also, I don't find revenge plots to be very entertaining, so that could have been an important factor as to why I was bored at times while watching this.

I liked the main couple. They're both great actors and had good chemistry. A lot of the supporting characters were quite fun, too. Huge cast in this one.

The OST, which tends to be a huge part of dramas, was completely unmemorable. So, if the same song playing each and every episode is something you find annoying, this is the drama for you! I don't even know if this show has a specific OST (though I assume it does).