Sushant Singh Rajput, one such star who made an entry into Bollywood through Television shows was just fine. With "Detective Byomokesh Bakshi", "Shudh Desi Romance", Sushant got identified well. His presence in India's biggest blockbuster PK made him more famous and he bagged a huge project to act in MS Dhoni's biopic too. He was also opted to act in Director Mohit Suri's "Half Girlfriend".
It seems that Sushant might be replaced by Arjun Kapoor. "Half girlfriend" is a movie that is inspired by a novel written by novelist Chetan Bhagat. Already, Chetan Bhagat's novels were being made as movies and were also encouraged by the audience well.
Sushant Singh Rajput, who even acted in Chetan Bhagat's novel- "Three Mistakes Of My Life" that was made as the movie- "Kai Po Che", is now opted out from the project probably. In a quote, Sushant said he was unfortunate that he could not adjust the dates for this movie Half Girlfriend.
So, it seems that the casting crew has approached Arjun Kapoor who was very apt in the movie 2 States, a book by Chetan Bhagat. More details are awaited.