The Heirs, one of my mom's fave because she's a fan of Lee Min Ho. I know, weird. As for me, I don't like it. I have quite a lot of rants about this. The only saving grace of this show is the performance of the supporting cast.
The lead roles are a bore. The girl (forgot her name) looks blank the entire length of the show. When she cries or sad (pretty much her emotion the entire show), when she's in love, or happy, or even when she is being kissed by the lead guy, she looks basically the same.
Lee Min Ho (the lead guy) also looks boring or bored when with her. You can notice that when he's interacting with the supporting cast that his demeanor changes, he lights up and is genuinely being funny or cute. Lead girl basically drains the aura out of him. :/
This story kinda reminds me of Hana Dan (F4 - depends on which version you've seen). Rich guy, poor girl, rich guy's school.
But Hana Dan was more fun than this. All the girl here has ever done was cry. Boohoo! Hana Yori Dango was very amusing whichever scene you watch: the leads (couple), the F4, schoolmates, girl's friends/workplace, her family...
The Heirs failed to entertain me. The only thing I am grateful for is that I've discovered Krystal (Lee Bo Na). I've realized after watching that I really enjoyed her performance and that I like her. :D