Filmmaker Mani Ratnam seemed to have shot upcoming Tamil romantic-drama "Okay Kanmani" at such a breakneck speed that it's almost complete. It is touted to be his quickest project. The film's shooting started in October. The film's cinematographer P.C. Sreeram recently tweeted: "Travelling time to reach our next destination. Mani gets the best of performance - it was mesmerizing. 99.9 % finito (sic)". The team is currently shooting in Mumbai. "Last week the team shot some campus sequences at IIM Ahmedabad and CEPT University. Now, they've returned to Mumbai to complete rest of the portion," a source from the film's unit told IANS. The film features Dulquer Salmaan and Nithya Menon in the lead roles. Nithya plays an architect student, while renowned Indian architect B.V. Doshi plays her professor in the film.