This is the korean version of the manga made in 2009, and is one of the most famous, well-recognized and loved kdrama of all times, with its casting and direction. If one hasn't watched this, he hasn't even seen the essence of kdramas.

It is also an adaptation of the same Boys Over Flowers Saga and I must say that it is my favourite.
The acting is superb and the casting as well as the direction. The modern touch and new innovation has definitely made it worth the watch.

The story is very similar. I believe the Korean version is adapted from it. The main lead is a joyful girl, neighbors with the guy who is good at studies and has a crush on him. The second male lead is also a swimmer who likes the girl