만날 겠습니다 is wrong. It should be 만나겠습니다 (not 날) The rest of the sentence is perfect.
Here are some different ways to say it.
- 한국에 가서 X를 만나겠습니다 = I will go to Korea and meet X.
- 한국에 가면 X를 만나겠습니다 = If/When I go to Korea, I will meet X.
- 한국에 가게 되면 X를 만나겠습니다 = If/When I get to go to Korea, I will meet X.
If you want to say it a little less strongly, you could say 만날 것입니다 or 만날 거예요 instead of 만나겠습니다.