who is teacher marcus?

I recorded a video of myself while I was conducting my class on the phone with one of my korean students. If Im not mistaken, the student name is Ricky or David. This student was already good. His comprehension worked well though I still have to speak using simple terms since he is only 12 years old.
It was really funny because I can now see myself behind the phone. I mean how to I react in my student's answer, my gestures, and the likes..very funny..
LOL! LOL! LOL!