I finished Last Friends quite awhile ago, I joined this community just yesterday.
Just a bit of background info, my family in general loves soap operas and dramas, but I never really took a liking to them. I suppose it was just too much exaggeration for a person like me to bear. When I say a person like me, I mean I really like books and shows that make you think a lot ... Psychologically or just plot twists. (That must make you think, Dramas have plot twists too... well, ones that aren't as predictable and woven well into the fabric of the story.) In general, I always regarded dramas as things that were a little too shallow for me to like.
I heard about Last Friends through the fact that Utada Hikaru was singing the theme song. I'm a really big fan of Utada, and I loved Prisoner of Love.
Cringing slightly, but still hoping that the drama would be "worthy" of the song, I watched the intro.
The symbolism astounded me, especially how the myth about the "red string on your finger" was subtly slipped in. (Other instances of symbolism was probably how everyone but Sousuke walked towards the screen.) I have to say though, that when Ryo was shown in the intro... I couldn't help but feel the need to watch it. (If you've read my profile, I've said I have a thing for guys that look good in suits... this is interchangeable with ties.)
That's the story of how Last Friends broke my high wall about dramas.