Here's why:
* Korean Actors & English: Many Korean actors, even those with international fame, don't speak English fluently. This is common in many countries, and Korea is no exception.
* Lack of Public Mentions: There are no interviews or public statements indicating Chun Jung Myung speaks English. If he did, it would likely be mentioned at some point.
* Focus on Korean Work: Korean actors primarily work within the Korean entertainment industry, which doesn't require extensive English skills.
While it's possible he knows some basic phrases, it's highly unlikely he's fluent.