Raaj's character was brought in as a patient in the hospital, who threatens Yuvi on various things about his past and plays around with his emotions and his girl friend Naina, and he is also shown as a drug addict.
Let me recall the whole scene:
Dr. Kirti is reported that some drugs have been stolen from the store, the security is checking everyone, Dr Riddhima is also walking towards the exit, lost in her confusion of life. Raaj very smartly transfers the drugs in to her bag. She gets out being known to everyone. Once she is on the road, Raaj comes on his car and tries to run her over??? (why not just steal the bag!) Sid saves her and he gets injured very badly. She brings him back to the hospital in a dramatic effort and when the police comes to arrest Dr. Riddhima. The inspector is very keen to arrest her, with handcuffs on so that Sid can come to her rescue again. Yuvi at that stage suspected Raaj for this incident and kept quiet.
Now Raaj is an intern, apparently not on drugs anymore and no one suspected him for that hit and run. His current importance is that he is a vote in favor of AR.
Is he the same Raaj and can he be linked to the Raaj who came as a patient in the hospital?