The author said there was some "misunderstanding" as his book is a work of fiction.
Chandra Vijay Singh has brought the defamation suit against Bhagat for allegedly portraying the male members of his family in negative light.
Bhagat said there was no relation between the family he mentions in his book with the real one.
"Somebody in Bihar feels they belong to the family, which is fictionally represented in the book. But it is fiction. So the question of defamation does not arise and I don't know these people. I don't even know they existed.
The author is confident that the matter will be sorted out.
"The court will decide. It is almost a compliment if people feel my story in 'Half Girlfriend' is real, it is not. I am shocked that people feel that way," he said.