To be a korean news anchor in korea do you have to graduate a korean university?

I think it's very unlikely that someone who studied outside of Korea would be able to become an announcer. The most important thing about being an announcer is pronunciation. This probably takes years to master as is probably practiced throughout college. General knowledge is just as important. It can't be too beneficial to study Korean politics and event while studying abroad. I wouldn't be surprised if most of them can speak some English, but there really is no practical need for English on tv. Also keep in mind that the average announcer is very smart.