After the release of first theatrical trailer of the film, a kissing scene by her made a controversy as she was a minor. Her appearance was kept away from the media prior to release, with a clause in her contract preventing her from partaking in media interaction.
Portraying the role of Beatrice, a young nurse with a child like personality, Thulasi worked alongside an ensemble cast including Arvind Swamy and Arjun and shot scenes across coastal Tamil Nadu.
Thulasi lost twelve kilograms for the film and she went through a series of pre-production workshops conducted by actress Kalairani before the first schedule. She would feature alongside fellow debutant Gautham Karthik in the leading roles, coincidentally 32 years after her mother and Gautham's father had also debuted together in Bharathiraja's Alaigal Oivathillai (1981). She was initially rejected with the director noting she was "too young for the role", before the team chose to sign her following Samantha's exit from the project. At age 14, Thulasi was first considered for a role in director Mani Ratnam's Kadal after being recommended by actress Suhasini to audition for the lead role in November 2011.