Despite the flaws, I could enjoy it, & what I like the most from this show (so I’m willing to rate it high) are:
1. I can feel & sympathize with most of the characters.
-Tan: I hope he can get his freedom with his mom & Eun Sang, also be kind with Won.
-Eun Sang: as the only poor/normal person in this show, I just wish her a normal & happy life with her mom & Tan, but I know the wall between her & Tan is too high to climb.
-Young Do: he has chemistry with Eun Sang, but I ship them to be friends instead of couple. Besides his ‘habit’ of bullying, he has that side of sad boy, that’s why I want to see him happy & heal his wound. I love Young Do & Tan’s friendship & its dynamics, like love & hate rlship, but deep in their hearts, they understand each other very well.
-Chan Yeong & Bo Na: they’re cute couple. At first I thought she’s annoying, antagonist, but turned out she’s kindhearted, that’s why she’s perfect with Chan Yeong. They’re the ones who Eun Sang can rely on.
-Hyun Joo: she’s pretty & kind. I ship her with Won, she’s such a supportive & selfless GF. But I also ship her with Hyo Shin, LOL.
-Won: his being jealous, cold, harsh on Tan is reasonable for me. I’m glad this siblings finally comes to an understanding.
-Hyo Shin: another boy from rich family that I sympathize with. He’s kind, calm, logical, & deserves love. He’s best friend with Tan & I like it.
-Myung Soo: the brightest & the silliest character, the most fun to be with. I can say he’s the only one that I don’t need to worry.
-Tan’s mom: surprised that I can sympathize her. I just wish her freedom from that family & I’m glad Tan can make a move to stand for her mom.

With me being this attached to most of the characters, I can see why this drama be that popular, why LMH & PSH be fav couple, why the other casts also grew their popularities. (I saw a clip of “The Judge from Hell” interview with PSH & KJY, I was surprised that “Kim Tan” was mentioned there, like, is Kim Tan & Cha Eun Sang that popular?? The most popular of PSH’s co star?? Now I get it).

2. Also love the dynamics/storyline, ups & downs of each character. I even enjoy & accept the ending for each character. Some are happy, some are realistic. It’s ok. They all deserve it.

3. Last but not least, I enjoy the love story between the leads, their ups & downs is really something. It’s my 1st time seeing Lee Min Ho, also Park Shin Hye. I think I started to like PSH, will try her other dramas.

Overall, to me it’s a heavy drama, melodrama. I need to stop twice to finally finish it. First, in ep5. Like I wasn’t ready to watch the bullying in a hi-so school, what kind of life Eun Sang will face when she gets there. Second, in ep17. Like why the problems are getting more complicated like there’s no way out. I needed to watch anything light to refresh my drained energy, LOL.
Overall this drama tells about rich families with their typical problems. Yes it matches the title “The Heirs”. Tan & Won’s family, Young Do’s, Rachel’s, Hyo Shin’s. Wealth, position, heirs, greed, unsincerity. With all of those negativities, it’s good that they show us the side of human from the “antagonists”, like Chairman Kim, Young Do, Rachel, Rachel’s mom, etc.
I keep thinking “ooh, how childish” when Tan, Young Do, Rachel, etc deal with their problems. But in the end, they’re just 18, rich, & spoiled. It’s just normal for them to act that way. Another thing, I’m okay with Eun Sang’s character. She’s just a normal girl who wish a normal life. It’s normal for her to avoid any kind of dramas around her. Also normal for her to be hesitant in dating Tan. But I’m glad she finally can show her feeling, support, sincerity to Tan, & fight together.