Update : I sat in the third bench in next class. The professor looked very depressed, as if he will cry any time. The weather of the class was very sad. This is really irritating. What does he want from me? He has wife, children at home, and in the class he wants free entertain from me or what? Anyway, my purpose is served (for one day at least). He didn't / couldn't do anything that can distract me from concentrating on the topic he is teaching. Hoping he continues teaching normally, forgetting me.

Yes, of course class mates can not force me, they are calling me repeatedly to sit in first bench, and I have started denying recently. Thanks I was also planning this. I will try this out.