This package let your iPhone has an alternative 5 row Korean keyboard for iOS4.

There are three layouts now and you can choose them in the submenu of keyboard settings.
5Row-Korean: The special characters of first row are same as your computer keyboard.
5Row-Korean-CustomSymbol: The special characters of first row are which in common use.
5Row-Korean-Numeric: No special characters for first row, only numbers.

After you install this package, please use Winterboad to apply the them.
Then, go to Settings > General > Keyboard > International Keyboards, Choose Korean> 5Row-Korean.