K-pop people: What's happening in this DJ DOC video?

K-pop people: What's happening in this DJ DOC video? They're obviously parodying a whole bunch of popular Korean groups, but I'm hardly one to understand the nuances, or even the broad sweeps; 'cept obviously at one point they're doing a goof on After School's "Bang!," which is my Korean track of the year, though this DJ DOC one - "I'm A Guy Like This" - is pretty damn good itself, and shows a pronounced Cuban/Cuban American tinge. According to kpoplive.com, also being ribbed here are Lee Hyori, CN Blue, and Big Bang, the last two I don't know anything about.

"DJDOC나이런사람이야 뮤직비디오" (Watch on YouTube)

( And what's happening in this stage presentation? )