It was good, fun TV shows. While it is obviously cliche to me, but it is not bad at all. It is your typical rich boy and poor girl who loves each other storyline. I notice it has some cringe moments, but the storyline executed well. The problem is that it has too many supporting characters, so some of them have little character development. While I understand why it have 20 episodes because of these characters, I think it should have more plot. The other problem is that some episodes are dragged especially last few episodes. The OST and music was okay to me. The reason I watch Heirs is Park Shin Hye and Lee Min Ho. They have a good job in their roles, but their roles are decent.