Hello,
You need to provide two font files - the normal and the bold versions. Can you try the following and let me know if it helps? [Don't forget to replace NanumGothicBold.woff below with correct file name]
@font-face{
font-family:NanumGothic;
src:url(http://frontrange.kr/intranet/font/NanumGothic.woff) format('woff');
font-weight: normal;
font-style: normal;
}
@font-face{
font-family:NanumGothic;
src:url(http://frontrange.kr/intranet/font/NanumGothicBold.woff) format('woff');
font-weight: bold;
font-style: normal;
}