The DSP trains Velu and sends him back to Billa's gang, disguised as an amnesiac Billa, who had been hiding at an apartment complex due to his injuries. Slowly Velu starts to learn about Billa's gang and even speaks to Jagdish, Billa's boss, on the phone. Velu provides a pen drive with the secret information of the crime network to the DSP, but he is about to be killed by Sasha (Nayantara) because her brother Rajesh as well as his fiancée Rhea (Hazel Keech) were killed by Billa earlier. At this juncture, the DSP arrives and tells her that he is Velu and not Billa. Later before a party, Velu secretly provides information to the DSP about a meeting of Billa's network and C.J. (Namitha), Billa's girlfriend, overhears his conversation. She confronts Velu but in the struggle, he accidentally kills her. A shootout occurs at the party and the DSP is killed by Jagdish, leaving his gun behind. Velu finds the DSP's body and the gun, but is taken into the custody of the police team, now headed by Interpol Officer Gokulnath. He argues during interrogation that he is Velu and not Billa to Gokulnath. Velu mentions a piece of evidence – the pen drive which may prove his innocence but the pen drive is nowhere to be found.