Q: quit VoiceOver

Hello younyeochang,

Thanks for using Apple Support Communities.

To turn off VoiceOver, simply do the following:

You can turn VoiceOver on and off at any time; you don’t have to restart your Mac or log in again.

• Press Command-F5. If VoiceOver is on, pressing Command-F5 turns it off.
• Press Command-Option-F5 and then select the option in the Accessibility Options panel. To view all OS X accessibility options, click Preferences in the panel.

VoiceOver Utility (Mountain Lion): Turn VoiceOver on and off

http://support.apple.com/kb/PH5757

Take care,

Alex H.