Unlike the vast majority of Kdrama addicts, this was not my introduction into the Kdrama fandom. So anyone's argument stating that only beginners would find enjoyment in it is completely false (first of all, the great thing about opinions is that they're subjective) but my enjoyment of this as a non-beginner does prove that theory wrong.

-I will credit the makers of that theory with the idea that the plot/story is entirely funky/ messed up (in reality I might use another word for "messed" that starts with an f), but with that, IT IS SOOoOoOOOooOoOOoO GOOD, it's one of those that takes you on a complete adventurous thrill ride from beginning to end, one that makes you nostalgic when looking back at previous phases of your journey, one that has you looking back at it as a whole after it's over thinking "wtf did I just watch      ...       I think I want to watch it again" (although, that's NOTHING in comparison to its predecessors Hana Yori Dango the Japanese live action seasons 1 & 2, and ESPECIALLY Hana Yori Dango the Japanese anime.).
(Sidenote, a huge problem I have with kdramas [particularly of this similar style and that came out around the same time] is that they're TOO dramatic. I know. Kdrama/dramatic. It's in the title, but still. This one did a PERFECT STUPENDOUS WONDERFUL job at balancing the types of feels [primarily the dramatic/heart feels with the laughter comedy feels])
-The acting is STELLAR. If you don't fall in love with a single one of the sides, I will give you my firstborn. Because that's impossible. To name names, Kim Bum is a large fan favorite in this drama (He's the clay player dude guy) (and also my favorite actor period) (this was the first drama I saw him in) (he is spectacular), but surprisingly not my favorite side (I know, "Srsly?? How can he be your favorite actor and not your favorite character??"). Well, that's because of good ol' Kim Joon (He's the mafia boss son) (and also the member of the F4 [or maybe any side character] with the littlest air time) (but boiiiiii does he make it count). Same goes for Kim Hyun Joong. Low key a proven terrible person in real life (more info on that in my "Least Favorite Actors" list, check it out!), but he plays that role perfectly, I believe there are very few that would have played it better (as proven by the fact that in every other Boys over Flowers adaptation I've seen, I've rooted for the other guy, in this one, Kim Hyun Joong was the OTP). Personally, I can't stand Lee Min Ho as an actor, but this was one role I was ok with his work. Also the lead and her best friend were outstanding!
-I'm pretty sure I'm classically conditioned to start crying of all the feels everytime I hear that cheesy music. Seriously, no one turn it on. Not because its bad, but because I will seriously start having an emotional heart attack. No joke. Or exaggeration. It has happened.
-I would rewatch it in a second if I didn't have so many darned adaptations of it to watch, or just dramas in general to watch, or a life. That to.
-9.5 outta 10 recommend (to anyone... at any stage in their drama-ing life)