Koreans don't speak english with that confidence as our education mainly focuses on reading and grammar not listening and speaking. Even though he speaks broken english, I'm proud of him having conversation in eng freely.
He already apologized to his wife and also regretted on his actions. His wife also forgave him and in fact they are a very sweet couple! Plus, the whole cheating thing was like 1+years ago and I don't get why people are still bringing it up.