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https://bugzilla.redhat.com/show_bug.cgi?id=569340
--- Comment #13 from fujiwara tfujiwar@redhat.com 2010-03-23 22:41:00 EDT --- It seems cairo calls freetype which returns horiAdvance = 0 with UnDotum. Probably the rendering is right.
I googled "jongseong" and it seems to mean the end char. http://www.open-std.org/Jtc1/sc22/wg20/docs/n1037-Hangul%20Collation%20Requi...
I'm not sure but I guess the jongseong char range U+1100 - U+11FF is designed to generate other chars and the UnDotum font creator expects with width 0 in the single usage.
I guess if you want to show the single consonant, probably you could use U+3134 'ㄴ' instead. Then personally I think it's not a bug?