I don't wanna say best I'll ever watch because you never know when you're going to find an even better drama. I've been lucky so far in that all the Drama's I've brought I've enjoyed...
My favourite has been Remote (Control) with Koichi and Fukada but I really loved Kurosagi too that would be a close second :-D
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Anata no subete wo shitte imasu - MC KAMIYAMA