I knew coming in that this was going to be a cheesy teen romance drama, so luckily I didn't set myself up to be disappointed. That being said, it was still entertaining enough for me to watch till the end. Not a horrible drama, but not that great either. So, let's get the bad things out of the way first. The story was awful. Nothing really happened. It was a big circle with lots of little circles in it. The narration at the end even says something like "not much has changed," and I agree. A few things get a little better, a few things get worse, but mostly nothing's different. Another problem with it was that there were way too many characters. It made it hard for any of them to have time to be fully developed. The music was awful and annoying. Not much more I can say about it besides that. And a lot of the costumes were horrible. (*cough*uglysweaters*cough*) Now, on to the characters. This is kind of a gray area as far as good or bad. I really couldn't get into the leads at all. Kim Tan was a character I had a hard time rooting for. It's a pity because I actually liked Lee Min Ho's acting despite the character he had to work with. The kid's acting improves with each drama he's in. Cha Eun Sang was pretty much just your typical cliche female lead. There wasn't much chemistry between them either. t lot of the parents were annoying and just there to cause drama. There were so many wasted characters, like big bro Won and his love interest. But then there were the characters who made up for the awful ones. So many amazing characters! Characters who kept me watching through the crappy storyline. Choi Young Do was the best character. A bit psychotic, but still the best. I didn't ship him with Eun Sang or anything, but I loved every scene he was in. And Kim Woo Bin did an amazing job playing him. I really think that boy needs the chance at a lead. Chan Young and Bo Na were also my favorites. Such a cute couple and really good friends to everyone. I loved the relationship between Tan and Eun Sang's mothers. Hyo Shin was a great character who I wish would've been given more chance to develop. Overall, a really great supporting cast. So, basically, dumb story, boring leads, but an amazing supporting cast who kept the whole thing from falling apart. I'll probably never re-watch it, but Heirs was fun while it lasted.