What are they thinking?

For the past 2 hours, students have been standing at my office door, peering in the tiny window and STARING AT ME with no shame! I usually look up and wave, but sometimes I just continue to work at my desk as if I don't notice their inquiring eyes. There is one girl imparticular, who has been coming every 3 minutes or so to stand and look at me. I can't discern the look in her eyes. It's almost like the look you see on the infomercials of the kids in African who are starving with flies around their faces. If only I knew what she was thinking... I would give 500 won to know! (That's about 30 cents!)