This drama is one of biggest hit, story wise is not really good but if you're a avid consumer of korean culture it's a must-watch (even just to get the reference). F4 is such a iconic meme, you will always see someone mention it.
Acting wise is so so, ML and FL dont have chemistry at all. The ending barely makes sense (what the hell happened with mom bad btch? Just give up like that?Since when she wants to be a doctor?).
Now, on serious note bullying is one big problem on Korea (in the whole world really) and having a drama being nonchalant about it is icky to me. You cant go around saying that bullies can change once they fall in love and deserve a happy ending too, bullies should be punished to the extension of law.