Mouni Roy is an Indian television actress. Roy was born in Cooch Behar, West Bengal. She is known for her roles as Krishnatulsi in Kyunki Saas Bhi Kabhi Bahu Thi, and Sati in Devon Ke Dev…Mahadev and for playing Shivanya (Naagin) in Naagin. She also played Meera in Junoon – Aisi Nafrat Toh Kaisa Ishq. She was a contestant and finalist on Jhalak Dikhhla Jaa in 2014.

Naagin is an Indian serial drama television series, which premiered on 1 November 2015 and aired every Saturday and Sunday on Colors TV. It is produced by Ekta Kapoor under the banner Balaji Telefilms. The show stars Mouni Roy, Arjun Bijlani and Adaa Khan in lead roles. Sudha Chandran plays the main antagonist. Naagin has been a ratings success and since its inception it is one of the highest rated show on Indian television and won numerous awards.

This is a story about two Icchadari Naagins named Shivanya and Sesha. Shivanya’s parents were taking care of Naagmani but were killed by five people: Viren, Suri, Sailesh, Ankush and Yamini. Shivanya was not able to see two murderers:Suri and Yamini. Ankush and Yamini had a son, Rithik. Rithik’s childhood friend Tanvi wanted to marry him but he was not interested in this wedding.A Pandit of their family told Yamini that in Rithik’s Kundli Markesh Dosh is written.She bought her family to panchner haveli.Shivanya enters the house as a maid.Rithik begans to love Shivanya.In search of network he reached the site where Shivanya’ss parents were murdered.Then she saws Sesha and follows her.Then he falls from the cliff.

Shiv ji saved Rithik from dying.His family comes there and take Rithik back home.There was a celebration in the haveli.In that Celebration Sesha came and mixes poison in a cup of water.She becomes a waiter and gives it to Ankush but mistakely she had given the poison to wrong person.
Viren asks Shivanya to come on jalebi hotel and spend some time with him.She comes there with a plan to kill Viren.Shivanya bites Viren.Then viren goes into coma.Sivanya got to know tat if Tanvi and Rithik will marry then the family will reside in america forever.She was able to stop the marraige between those two but has to marry him herself.Gurudev told Shivanya that one of the killers not seen by her has six fingers.So,she asked Amrita that is anybody in their family has six fingers.But Shivanya didn’t get an answer.