[OS X]: When a mixture of latin and Hangul text is drawn with an underline then there is a gap in the underline on a retina display

[OS X]: When a mixture of latin and Hangul text is drawn with an underline then there is a gap in the underline on a retina display. In the example attached, the underline is drawn fine when it is not shown on a retina display but there is a gap between the latin and the Hangul characters when it is on a retina display.