SNSD(소녀시대,少女時代,Girls' Generation) created new 四字熟語 (four letter kanji word) 「九人十色」(きゅうにんといろ、kyūnin toiro), which is probably a modified version of 「十人十色」(じゅうにんといろ、jūnin toiro), in the "The Boys" Lyrics.
十人十色 means 10 people can have 10 different personalities/characterisitics/individualities ("So many men, so many minds" in English, probably).
So now 9 people can have 10 (more than 9) different personalities/... with 九人十色, may be more close to English equivalent.
IB (International Baccalaureate)*
4 days ago