Karan Singh Grover joined the cast of Ekta Kapoor's reboot of Kasautii Zindagi Kay as Rishab Bajaj, a character immortalised on the small screen by Ronit Roy . As of now, Rishab Bajaj is exiting from the lives of protagonists Prerna Erica Fernandes and Anurag Parth Samthaan but Karan Singh Grover says that he'll be 'back before you know it.