Producer Udhayanidhi Stalin’s Oru Kal Oru Kannadi has given in for everyone’s attraction for its cool sang-froid trailer that was screened along with Suriya’s 7Aum Arivu. The film is directed by Rajesh of Boss Engira Baskaran and Siva Manasula Sakthi fame. Only a line from the song ‘Kadhal Oru Butterfly’ was aired in teasers and it apparently captured everyone’s senses. While the audio launch is scheduled this evening, the songs are already aired on radio channels and it is receiving moderate response. The audio will be launched this evening by Suriya while the trailer by Karthi at Sathyam Cinemas.