Who was resposible for bepin choudhary,s …

In the vey begning of the story it told about the habit and work of Bepin Babu.as told that on every Monday he used to stop on a book shop to purchase the books of his interest.
But one day ,he encountered with Parimal Ghose,who had recognised Mr. Bepin Babu.but Bepin refused to identify him.
As proof, Mr.Ghose narrate him Ranchi incident but Bepin replied that he had never been to Ranchi and told that I don’t know Ghose also.Laterc Ghose described him his personal details as family-wife and kids ,Dinesh Mukerji,his bunglow etc.
But Bepin Babu was not ready to believe.
Bepin think over it.he was confused whether he Ghose was telling lie or he was losing his memory.then he decided to ring up Dinesh Mukerji. So that he could confirm the matter.
He talked to Dinesh.but he also replied in positive and recollected all other events also.hearing all his head began to spin.
Next day when he reached home from office,his servant told him that Mr.Chunni Lal Wanted to meet with Babu for economical help.but Bepin Babu refused.he wants to confirm the matter.in reply Chunni also positively replied. Now he  called for Dr. Paresh Chanda, who gave him remedy.
At the end of the lesson ,Bepin himself went to HudrooWhen he reached Hudroo , he felt unconsciousness there . when he opened his eyes , he found himself in Calcutta . Few minutes later Bepin's servant brought a letter which was describing  Chunni’s revenge . now Bepin understood all the matter .when Dr. Chanda again came to treat him,  he was totally surprised when Bepin told him that he was better now.
He just needed a pain killer as he has fallen in Ranchi.