Nenek menulis:
I have played GuZheng.. It is very nice, and not to hard to learn, I didn't think. If I remember correctly Koto was rather hard to play..
But I still think Ga Ya Guem is the hardest instrument among all Jins... Aiya...

Nenek, but Guzheng = Koto. It has 21-23 strings.
According to literatures I've read, guqin is much difficult to be played since it only has 7 strings.