Just on a lark I added " 한국어 자막" to my YouTube search and ran across Conan O'Brien's "Clueless Gamer".  My all-boys class loved it as a reward video for keeping focus on a Friday afternoon.  Mild profanity and video game violence so screen it ahead of time, but it kept my toughest audience engaged.

Here are two--there are others. http://youtu.be/wAA_sokqN7g  Injustice (DC Comics fight game) and http://youtu.be/fUEMZd2VImY where he explains the concept behind "Clueless Gamer".  I caught a couple of minor translation errors (Folan should be flan) but I don't speak enough Korean to know for sure about the rest of it.