Aside from Happy Birthday and I Love You, perhaps the next most requested translation from English to Korean is the phrase ‘I Miss You’.
The most common way to express this is 너를 보고 싶어요 (Noreul bogo shipoyo) literally translated as I want to see you but it does mean I miss you. One can also say 너를 그리워요 (Noreul kuriwoyo) which translates directly to I miss you.
You can replace 너를 (Noreul which means you) with the name of the person that you miss.
Missing someone? Go tell the person you miss him/her in Korean =)