His entry on the show will be telecast Monday.
The show will feature a sequence where character Zain's parents Osman and Suraiyya will be seen on a mission solving the mystery surrounding the disappearance of their daughter, Barkat.
Suneel will portray Osman's estranged friend Mir Khan, who holds the key to Barkat's secret and is the only one who can help Osman and Suraiyya to trace their daughter, said a statement.
Suneel Sinha has previously played prominent roles in films like "Maachis", "Rudaali" and "Aamras : The Sweet Taste of Friendship".
He has also featured in TV shows like "Uttaran" where he played the role of Tej Singh Bundela and was also seen in "Preet Se Bandhi Ye Dori Ram Milaayi Jodi".