Oru Kal Oru Kannadi

Oru Kal Oru Kannadi (transl. A Stone, A Mirror; abbreviated as OKOK) is a 2012 Indian Tamil-language romantic comedy film written and directed by M. Rajesh and produced by Udhayanidhi Stalin of Red Giant Movies. The film stars Udhayanidhi, Hansika Motwani and Santhanam, with Saranya Ponvannan, Sayaji Shinde and Azhagam Perumal in supporting roles. The story revolves around Saravanan, who travels from Chennai to Puducherry with his friend Parthasarathy, to stop the wedding of his ex-girlfriend Meera. During the trip, he recollects his past with Meera and the events before their break-up.

Oru Kal Oru Kannadi is the acting debut of Udhayanidhi, and was named after a song from Rajesh's directorial debut Siva Manasula Sakthi (2009). Principal photography commenced in March 2011 and was nearly complete by February 2012. The film was predominantly shot in Chennai, Madurai and Mumbai, with song sequences in Jordan and Dubai. The film's music was composed by Harris Jayaraj with cinematography by Balasubramaniem and editing by Vivek Harshan.

Oru Kal Oru Kannadi was released on 13 April 2012 and was deemed a major commercial success. Santhanam received numerous accolades for his performance, including an Ananda Vikatan Cinema Award, Chennai Times Film Award and a Vijay Award for Best Comedian. The film itself received three nominations at the Filmfare Awards South, winning Best Male Debut – South (Udhayanidhi) and four nominations at the South Indian International Movie Awards, winning Best Actress – Tamil (Motwani). The film emerged a breakthrough for Udhayanidhi, who continued to act in leading roles in several Tamil films until his eventual retirement from acting in 2023.