Well, I can't actually correctly pronounce a lot of the sounds in Korean, and since there are several methods for romanizing the hangul, I can't always tell how something should be pronounced unless I see the actual characters. In "Jeon Ji Hyun," I would normally think "Jeon" and "Hyun" would have the same vowel sound, but if someone romanized the whole name, then the "yu" in "hyun" seems like it would be a "yoo" sound (like the English word "you")--unless it's just a spelling mistake. I only somewhat recently
mostly learned the korean alphabet (hangul or hangeul), so I'm still really bad at these things.

Oh, and I've gotten better at names, but I find that I start to forget characters' names from dramas I've finished unless there's something specifically memorable about it, like Kim Sam Soon, or the way KDW says "Joo Yoo Rin" all the time in My Girl.
