this is wat srj said in his interview which will explain u the question
"On the other hand when I play Vishnuji, I cannot do much research. I mean I cannot break things down and determine why he acts in a certain way because he is God. Having said that, I do understand that as God, he knows everything, he is aware of the past, present and the future but then again, he cannot disclose everything. He is bound by time and if he gives anything away before its time then it will lead to chaos. So, he knows everything but he is quiet and just maintains that all knowing smile and that is his personality.'
so vishnu was in pain wen his laxmi dissapeared but as he is knows that he will get her back via sm and which is also required for genearal functioning of rest shrushti , he has to hide his pain and concentrate on his duty , as he is god.
i just love srj , he understands his character so well and executes it perferctly.
i know here people are first fan of mohit annd than srj
but for me pranpriya is of prime importance
i wish a show on vishnu comes soon wid him as lead if he does not get desired fiction show soon.