Hmmm ??? So teacher get a paycheck if school student go to college ? (i'm confuse i don't really know, but... Do they really paid for that ?)
And how can he blackmail about someone that have only his grandmother, that herself is also sick and that they live poorly ???
There is a lot of people cruel in reality but to go to an extent of blackmailed your student when there is not even parent to support the paycheck of this blackmail... It's no more being cruel it is being idiot at this point...