Dedicated to my wife
...also people who want to install Korean keyboard and learn Korean typing.
1. Go to Google Play and search for Korean Keyboard.
2. Many different types of Korean Keyboard will appear.
I personally like Google Korean Keyboard (you can search for Google Korean)
3. Download and install. Wait until it finishes.
4. Go to setting, scroll down and find out Language & Input menu.Click it.
5. Check Google Korean Keyboard to enable it.
6. Change Default to Korean - Google Korean Keyboard.
7. Exit out Setting screen.
8. Open up any app (Web, Youtube, Note etc..) to test it out.