Let's start with the plot side by side characters;

Hierarchy is not about the rich or poor it's about who has more power in this chain, nobody gives a damn about teachers/principal because the school was established by the conglomerate Jooshin Group whose hire is Kim Ri An, that school is his playground, basically what we already see in Boys over Flower, The Hires, F4, Sky Castle, and Penthouse series already. Netflix spends a lot on aesthetics, Fancy cars, fancy backgrounds, beautiful cast, and costumes in the end they don't have much for the script.

Kang Ha (Lee Chae Min): This character has so much potential but the writer be like: no, he is a poor kid, let's make him clueless. A guy who comes to the school to find out who Bullies his brother later leads to his de@th, without any plan. He should take revenge But this is not a revenge plot (wasted). This is the 1st Kdrama I watched where ML became a side character. If he had not been in the story, it wouldn't make much difference. This story is supposed to be about his innocent brother Kang In Han's bullies & k!ller to get punished.

According to the title "Hierarchy" he should be fighting for justice in the system But joke on you, the title didn't justify the bland and predictable plot. Instead, the title should be "Rich Kids Problem" don't get it? Let's meet these 4 real main leads of the story;

Jung Jae I (Roh Jeong Eui): She is a cold & bitchy rich FL, who doesn't want anyone to know she is pregn@nt but she took the pregn@ncy test at his friend's birthday party when the whole school was invited, & didn't show that to her loyal childhood love/bf instead show that to a new friend Kang In Han who is a scholarship student gets bullied by her bf's friends.
Now I understand why she sits on the main poster while everyone is standing. She is the kind of girl who says something & does exactly the opposite.

Jung Jae I: You are my best friend He Ra since the moment we hang out.
Meanwhile: she never even considered her a friend, she didn't even acknowledge her.

Jung Jae I: You can have him (Ri An), I'm leaving for NY. Best of luck.
**A few moments later**
Reach to her farewell Party with her BF

Kim Ri An (Kim Jae Won): The second ML is the actual ML. Everyone is criticizing the plot but like him, he is a green flag? it wasn't his fault if FL didn't tell him the reason and ghosted him for 3 months. In the whole series, the only job he does as eye candy is walk, Ri An walks into the Hall, walks in the rugby field, walks with his sidekicks behind, and is a so-called bad boy who doesn't do anything except for yk what I mean?

His character isn't like Li Min Ho's The Hires where he was a bully, Ri An doesn't give a f**k to anyone he knows his classmates bullying a student because of him but he did nothing. In the end, he apologizes half-heartedly because Jae I said so. The only satisfying scene was when he beat FL's step bro.

Lee U Jin(Lee Won Jung): If you see him in My Perfect Stranger you know he is an excellent actor, but his role there is not that deep you can’t see aside from his looks.

Yun He Ra (Ji Hye Won): Her character is too predictable yet she did well. I think she doesn't really like Ri An, she actually wanted to be Jae I. She was just jealous but she is girls girl in the end.

You don't need enemies If you have friends like them. The plot doesn't have any mystery or thriller, the Main leads don't have any chemistry. Ri An & Jae I also don’t have any chemistry. The Second leads has more chemistry than the MLs. You can understand that* Ri An and Jae I liked each other since childhood but there is no point in Jae I liking Kang Ha when she said in the end that she liked him. The whole time she only liked Ri An suddenly saying this is so unnecessary. What is the point of telling him that?

In the end, if you think that the k!ller is arrested and Ri An admits that he was one of the bullies does it make any change?

Nope! The consequences that are not shown in the drama could be that it will be in your records that you were a bully and you will have fewer chances to be accepted into the prestigious University of SK. But they are the 0.01% of wealthy kids who don't consider those Universities instead they choose to went abroad for further studies.

The Bullies face the authority but Did they get punished?

No, they get back to their life like nothing happened. Imagine someone losing their life because of you and the maximum punishment for you is to went abroad on your Daddy's money. (It's not about Jae I)

Do I recommend Hierarchy?

No! But it's up to you because S1 has nothing to keep you if you have watched the good Kdramas you are not going to like that predictable cliche plot, but if you want to see the cast you could. Instead of watching Hierarchy, you could watch The Hires at least it has a story.

PS: I had a few questions, If Jae I paid Kang Ha's fees for those special classes why didn’t he attend it after she had gone? did she get a refund? maybe he attends separately who knows? Is Rugby popular in SK? This is 1st time I have seen Rugby in a Kdrama. If ML didn’t leak that one video, Ri An mother would also won’t do that, so, how does it leak?

Edit: My prospects for this series changed a lit bit, after seeing the post-credit scene (which I watched after roasting it) Maybe there are 7 more episodes of this series where ML takes revenge for his brother.