Asiana has notoriously one of the crappiest non-Chinese airline websites. That being said, there should be no problem re-directing yourself to the Asiana - Korea English home page through the pull down menu at the top right hand side of the page.
Your main problem though is there is no HOUSTON option as a destination. Call one of their American offices to price out something like ICN-SFO(OZ), SFO-IAH(UA).