Korean Font not displayed in spark Label

On Android 4.3 and 4.4 Korean font is not displayed. You only see squares.

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" backgroundColor="white" xmlns:s="library://ns.adobe.com/flex/spark" applicationDPI="160">
<s:Label text="고속도로" />
</s:Application>

There is a workaround on Nexus phones to add fontFamily="NanumGothic" however this does NOT work on Samsung Phones with Android 4.3 (e.g. Note 3, S 4)