Thanks for starting this thread, RF. I'm one of the "raving" ones mentioned by Lis. ;)
I fell in love with this drama at first sight, mostly because it's so well acted, I'm a Kame fan and I love Eriko Kitagawa's work. I was hooked the moment he stands by that aquarium, a scene so reminiscent of Baz Luhrman's Romeo & Juliet.
So I have the whole serie on my pc and downloaded the music a long time ago. I consider it the best drama soundtrack ever.
To me, Tatta Hitotsu No Koi embodies the traits I love the most about Japanese direction and scripts: a unique delicacy in expressing love, the attention to small, poignant details (the movement of a hand, a beautiful screenshot, the choice of colours, the often minimalist dialogues), the characters one can rely to, because they could easily be my friends and neighbours. Or it could be me.
I also loved that although this is a drama played by idols, there isn't the usual focus on how gorgeous they are. This is something which, honestly, has begun to bug me a little about K-dramas. As much as I love good-looking men, I don't need to be reminded at every turn of how gorgeous they look under a shower or what is the latest trend in terms of jackets and pants.
So, I liked the simplicity of it. :)