Glad you asked...
There are many words and phrases that you can learn to say in Korean from websites and books. You can look up what words you want to say. See the link to learn how to say I miss you in Korean. http://www.linguanaut.com/english_korean...
Then again, this answer might help you...
To say, I miss you, in Korean, you would say: Dangsin-ibogo sipseubnida. Besides being spoken in North Korea and South Korea, Korean is widely spoken in the People's Republic of China.

