different fonts and different line spacings

[Kiwon Um]

Hello. One question is here.

I'm now using the latest emacs from cvs, checked out at 22 May 2009.
In my .emacs configuration:
(set-face-font 'default (font-spec :foundry "xos4" :family
"terminus" :size 14))
(set-fontset-font nil
                  'korean-ksc5601
                  (font-spec :family "UnDotum" :registry "unicode-
bmp" :lang "ko" :size 14)))

The problem is that even though the sizes of both are same, the line
spaces between some English sentences are different with those between
Korean sentences. It seems to come from the properties of the fonts,
but I don't know much about this.

I wonder if it is possible to set this line spacing manually.
Thanks.