I will start off with saying that not everyone will like this drama. If you're looking for a unique story with major plot twists, then this drama isn't it. It also isn't for you if you can't watch a high school story / drama and want something mature.
This drama is based off a webtoon and the drama's story is a lot similar to teen / young adult romance stories or manga.
I did search online about the webtoon and will have to say I'm glad they altered the drama and didn't follow the webtoon completely.
There may be love triangles, but it's very obvious and not like the webtoon where there's uncertainty and could lean to either side. But what I do dislike about the drama is how they left you with an aching heart for one of the characters in an unrequited love.
I also loved a lot of the characters in this drama and the variety of characters they showed.
Ju Kyung's family are fun to watch. Her sister, Hee Kyung's reversed role relationship. I loved seeing her act in a way that most men are expected to behave in relationships and overall.
The story may be cliché , but I still had a great time watching it and was laughing through a good portion of the entire drama. All of the bromance scenes they showed were pretty fun to watch as well.
As for the story's message and how it was handled, there's not much to expect. But I do know that most dramas really don't emphasize much about the message and often stray away from it to not seem like it's a lecture. But I do wish they at least show consequences of bullying instead of a slap on the wrist like most dramas show.

Acting- I've seen a lot of bias hate towards idol actors like Cha Eun Woo and have to say that CEW did a decent job with his character. I've seen him in MIGB and his character from there is somewhat similar to Suho's. But in this drama, I could see that he's improved more than before. For me, Hwang In Yeop stole the show. He was just enjoyable to watch.

I would re-watch it only for my favorite scenes. I don't think I would watch the entire drama all over again.
As for the OSTs, I have to say they were wonderful, especially Chani's "Starlight".