Kasautii Zindagii Kay () is an Indian Hindi-language romantic drama television series produced by Ekta Kapoor's Balaji Telefilms on StarPlus. The show starred Shweta Tiwari, Cezanne Khan, Ronit Roy, and Urvashi Dholakia. The show aired from 29 October 2001 to 28 February 2008. Kasautii Zindagii Kay is one of the longest-running Indian television soap operas. The entire series is digitally available on Disney+ Hotstar.

Plot Anurag and Prerna fall in love, but fate repeatedly separates them. Komolika and Rishabh Bajaj play a vital catalyst in the story. Spanning eighty years, the story revolves around Anurag, Prerna and their children, Prem and Sneha, and eventually their grandchildren.

Chapters Chapter No. Episodes Chapter description Chapter 1 1 - 26 Anurag Basu and Prerna Sharma are in love. Mohini, Anurag's mother, wants him to marry Komolika. Chapter 2 27 – 67 Anurag marries Komolika due to his mother's emotional blackmail; Prerna is pregnant with his child. Chapter 3 67 – 108 Moloy recovers from coma and learns about Anurag and Komolika's marriage. Chapter 4 109 – 164 Komolika and Anurag divorce. Chapter 5 165 – 210 Prerna marries Rishabh Bajaj to protect the assets of Basu family. Chapter 6 211 – 276 Bajaj's wife Menka poses problems for Bajaj as they are not divorced yet. Chapter 7 277 – 330 Bajaj disappears after his accident. Prerna and Anurag get engaged and married happily. Chapter 8 331 – 374 Bajaj creates problems in Anurag and Prerna's paradise. He clicked intimate photos with Prerna in Pune by making her unconscious, later he used these photos to blackmail her with the help of Mr. Patel, who was also involved in Prem's kidnapping. Chapter 9 375 – 402 Prerna and Anurag's son Prem is abducted, due to the irresponsible behaviour of Prerna, who forgot to pick up Prem from school . Prerna had ignored her responsibility towards Prem many times before, because of Kuki, Bajaj's daughter. Prem dies. Chapter 10 403 – 441 Anurag and Prerna's marriage fell apart due to misunderstandings and Prem's death. Anurag marries Aparna, leaving pregnant Prerna alone for her misdeed. Chapter 11 442 – 472 Prerna is mad at Anurag and moves to Panchmeshwar with her daughter, Sneha. Chapter 12 473 – 511 After eight years, Sneha visits Anurag's house. Due to the pressurised situation, Prerna unwillingly decides to engage with Bajaj. Chapter 13 512 – 572 Sneha is diagnosed with leukaemia. Anurag and Prerna become closer due to Sneha's illness and have another child named Prem Jr. Bajaj realizes that Prerna only loves Anurag. Chapter 14 573 – 623 Aparna's plot to murder Anurag. Chapter 15 624 – 646 Prerna is accused of Aparna's murder. Chapter 16 647 – 685 Anurag does not show interest in getting back with Prerna, so she decides to marry Bajaj. Madhavi reveals her pregnancy, but Bajaj refuses to accept Madhavi as well as his unborn child. Chapter 17 686 – 757 Generation Leap: Shravan avenges his mother Aparna's death. Chapter 18 758 – 781 Anurag, Prerna and Bajaj meet with a fatal accident. Prerna suffers from amnesia; she only remembers her marriage with Anurag. After she regains her memory, she accuses Anurag of conspiracy, but she realizes her mistakes and apologizes to Anurag. Chapter 19 782 – 833 Bajaj's past comes out. Tanisha is Bajaj's child with Madhavi, whom he refused to accept so he could marry Prerna. Chapter 20 834 – 873 Yudi is actually Prem Jr. Chapter 21 874 – 928 Yudi's transformation. Prerna takes charge to change Prem. Chapter 22 929 – 993 Mukti and Yudi grow closer. Sharad assaults Mukti. Chapter 23 994 – 1022 An attempt to take Prerna's life. Chapter 24 1023 – 1048 Anurag marries Sampada. Prerna takes the blame for Sneha's offence and goes to jail. Chapter 25 1049 – 1069 After five years: Anurag and Sampada are living happily and have taken Prem and Sneha's responsibility. Bajaj destroys his business and leaves his family to suffer alone. He cut all relations with his family after finding out that Prerna can't love anyone but Anurag. Meanwhile, Anurag provides shelter to Bajaj's family. Prerna returns from jail. Chapter 26 1070 – 1101 Prem is shattered by Mukti's death. Chapter 27 1102 – 1163 Prem is taken to Panchameshwar for treatment. Chapter 28 1164 – 1202 Aparna's attempt to murder Prerna. Chapter 29 1203 – 1250 Kasak falsely frames Shravan for her condition and manipulates Bajaj against Shravan. Bajaj vows to destroy Shravan. Prerna shoots Anurag. Chapter 30 1251 – 1300 Twenty years later, Prerna's granddaughter Prerna (P2) is the protagonist. Anurag returns as Pratham Mittal. Chapter 31 1301 – 1358 Sampada confesses her crime. Prerna apologises to Anurag. Anurag exposes Bajaj that he is still alive. Chapter 32 1359 – 1394 Anurag exposes Komolika's plan. Chapter 33 1395 – 1423 Komolika points the gun at Anurag, but Prerna takes the bullet to save Anurag. However, both Anurag and Prerna die in each other's arms. Komolika falls off the cliff and dies. Prerna and Anurag unite in death. Prem writes a book: Kasautii Zindagii Kay on Anurag and Prerna's life. Mr. Bajaj is left alone forever and the two true love birds unite after death.

Cast Main Shweta Tiwari as Prerna Sharma: Veena and Rajesh's daughter; Shekhar, Shivani, Mitali and Mahesh's sister; Anurag's ex-wife; Bajaj's wife; Prem, Sneha, Jr. Prem and Kasak's mother; Vishakha, Tushar and Kukki’s adoptive mother (2001–2008) Cezanne Khan / Hiten Tejwani as Anurag Basu: Mohini and Moloy's son; Nivedita, Rakhi and Tapur's brother; Prerna's ex-husband; Komolika and Aparna's ex-husband; Sampada's widower; Prem, Sneha and Jr. Prem's father; Shravan's adoptive father (2001–2007) / (2007–2008) Urvashi Dholakia as Komolika Majumdar: Uma's daughter; Subroto's wife; Anurag and Akash's ex-wife; Prem and Shravan's foster mother (2001–2008) Ronit Roy as Rishabh Bajaj: Mahesh's brother; Menka's widower; Prerna's husband; Vishakha, Tushar, Kukki, Tanisha and Kasak's father; Sneha's adoptive father (2002–2008)

Recurring Deepak Qazir as Moloy Basu – Pranay and Sanjay's brother; Mohini's husband; Rakhi, Nivedita, Anurag and Tapur's father; Prem, Diya, Sneha and Jr. Prem's grandfather (2001–2005) (deceased) Kannu Gill as Mohini Basu – Moloy's wife; Rakhi, Nivedita, Anurag and Tapur's mother; Prem, Diya, Sneha and Jr. Prem's grandmother; Shravan's adoptive grandmother (2001–2008) Yatin Karyekar as Pranay Basu – Moloy and Sanjay's brother; Yamini's husband; Subroto, Anirudh and Kajol's father (2001–2003) Niyati Joshi as Yamini Basu – Pranay's wife; Subroto, Anirudh and Kajol's mother (2001–2006) Naveen Saini as Sanjay Basu – Moloy and Pranay's brother; Geeta's husband; Samay and Shulabh's father (2001–2005) Monica Pradhan / Jayati Bhatia as Geeta Basu – Sanjay's wife; Samay and Shulabh's mother (2001–2006) Poonam Narula / Smita Bansal as Nivedita Basu Sengupta – Moloy and Mohini's second daughter; Rakhi, Anurag and Tapur's sister; Anupam's wife (2001–2003) / (2006) Prachi Thakker as Rakhi Basu Sengupta – Moloy and Mohini's eldest daughter; Nivedita, Anurag and Tapur's sister; Praveen's wife; Diya's mother (2001–2007) Aparna Jaywant as Tapur Basu – Moloy and Mohini's youngest daughter; Anurag, Nivedita and Rakhi's sister (2001–2003) Manish Goel / Hiten Paintal as Anupam Sengupta – Chaini's second son; Praveen and Indraneel's brother; Nivedita's husband (2001–2003) / (2006) Manav Gohil / Tarun Khanna as Praveen Sengupta – Chaini's eldest son; Anupam and Indraneel's brother; Rakhi's husband; Diya's father (2001–2004) Ankur Nayyar / Pracheen Chauhan / Prem Agarwal / Vishal Puri / Aashish Kaul as Subroto Basu – Pranay and Yamini's elder son; Anirudh and Kajol's brother; Shivani's ex-husband; Komolika's widower (2001–2006) Tasneem Sheikh / Prerna Shah as Kajol Basu Sharma – Pranay and Yamini's daughter; Anirudh and Subroto's sister; Mahesh's wife (2001–2003) Rushad Rana as Anirudh Basu – Pranay and Yamini's younger son; Subroto and Kajol's brother (2001–2002) Hitesh Kriplani as Samay Basu – Sanjay and Geeta's elder son; Shulabh's brother (2001–2005) Om Bhanushali as Shulabh Basu – Sanjay and Geeta's younger son; Samay's brother (2001–2005) Nandita Thakur as Veena Sharma – Rajesh's wife; Shekhar, Prerna, Shivani, Mitali and Mahesh's mother (2001–2008) Manoj Pandey as Shekhar Sharma – Rajesh and Veena's elder son; Prerna, Shivani, Mitali and Mahesh's brother; Suman's husband (2001–2004) Kusumit Sana as Shivani Sharma – Rajesh and Veena's second daughter; Prerna, Shekhar, Mitali and Mahesh's sister; Subroto's former wife (2001–2003) Kishwer Merchant as Mitali Sharma – Rajesh and Veena's youngest daughter; Prerna, Shekhar, Shivani and Mahesh's sister (2001–2004) Shivani Gosain as Suman Sharma – Shekhar's wife (2001–2004) Mahesh Pandey as Mahesh Sharma – Rajesh and Veena's younger son; Prerna, Shekhar, Shivani and Mitali's brother; Kajol's husband (2001–2004) Anand Suryavanshi / Vivek Mushran / Nasir Khan as Vineet Khanna – Anurag's business partner and best friend; Madhavi's husband; Tanisha's adoptive father (2001–2006) Sonal Sehgal / Vaishnavi Mahant as Advocate Madhavi Bose Khanna – Menka's sister; Vineet's wife; Tanisha's mother (2004–2006) Poonam Joshi as Jyoti – Prerna's best friend (2001–2002) / (2003–2004) Sikandar Kharbanda as Indraneel Sengupta – Chaini's youngest son; Anupam and Praveen's brother; Komolika's spy (2002–2008) Himani Shivpuri as Chaini Sengupta – Praveen, Anupam and Indraneel's mother (2002–2003) Mini Ribeiro as Uma Majumdar – Komolika's mother (2001–2002) Prashant Bhatt as Akash Dasgupta – Komolika's ex-husband (2002) Ruby Bhatia as Menka Bose – Madhavi's sister; Rishabh's ex-wife; Tushar, Vishakha and Kukki's mother (2002–2003) (deceased) Vishal Sabnani as Tushar Bajaj – Rishabh and Menka's son; Prerna's adopted son; Vishakha and Kukki's brother; Tanisha and Kasak's half-brother; Sneha’s adoptive brother; Doris's husband; Tara, Jwala, Gargi and Kanishtha's father (2002–2008) Suzanne Bernert as Doris Bajaj – Tushar's wife; Tara, Jwala, Gargi and Kanishtha's mother (2006–2008) Tarana Raja / Preeti Puri / Amita Chandekar as Vishakha Bajaj – Rishabh and Menka's elder daughter; Tushar and Kukki's sister; Tanisha and Kasak's half-sister; Sneha’s adoptive sister; Tanvi's mother (2002–2007) Mansi Parekh / Garima Bhatnagar as Kokila "Kukki" Bajaj – Rishabh and Menka's younger daughter; Tushar and Vishakha's sister; Tanisha and Kasak's half-sister; Sneha’s adoptive sister; Tanvi's adoptive mother (2004–2007) Swapnali Kulkarni as Child Kokila "Kukki" Bajaj (2002–2003) Geetanjali Tikekar as Aparna Ghosh – Anurag's ex-wife; Shravan's mother; Kritika's grandmother (2003–2007) Yash Tonk as Debo – Anurag's friend; Aparna's ex-husband; Shravan's father; Kritika's grandfather (2004) Unknown as Prem Basu – Anurag and Prerna's elder son; Sneha and Jr. Prem's brother; Kasak's half-brother (2002–2003) (deceased) Jennifer Winget as Sneha Bajaj/Basu Gill – Anurag and Prerna's daughter; Bajaj's adopted daughter; Prem and Jr. Prem's sister; Kasak's Vishakha, Tushar and Kukki’s half-sister; Sharad's ex-wife; Omi's widow; Jr. Prerna's mother (2005–2007) Shriya Sharma as Child Sneha Bajaj (2004–2005) Shabbir Ahluwalia as Omi Gill – Sneha's second husband; Jr. Prerna's father (2006–2007) Moonmoon Banerjee as Sampada Basu – Anurag's wife (2005–2007) Karanvir Bohra / Vikas Sethi as Yudi / Jr. Prem Basu – Anurag and Prerna's younger son; Prem and Sneha's brother; Kasak's half-brother; Devki's husband; Palchin's widower; Dhara and Rudraksh's father (2005–2008) Tina Parekh as Mukti Deshmukh – Jeevan's daughter; Jr. Prem's love interest (2005–2006) (deceased) Devki Basu – Mukti's lookalike; Jr. Prem's second wife; Rudraksh's mother (2006–2008) Shubhangi Atre / Monika Singh / Shriya Bisht as Palchin Verma Basu – Jr. Prem's ex-wife; Dhara's mother (2007–2008) Kratika Sengar Dheer as Jr. Prerna "P2" Gill Garewal – Sneha and Omi's daughter; Saksham's love interest; Nihal's wife (2007–2008)