The characters are:
Dr.Yuvraj Malik:
He is 25 years old and is an intern in Sanjeevani. Hates Dr.Shashank for some reason and has come to Sanjeevani just to take revenge from Dr.Shashank. Doesn't get along with Dr.Naina but later they will fall in love. Best mates with Adhiraj. He is a cool dude. Not really mates with Dr.Sid but will become friends afterwards which will then turn into enemity later on.
Dr.Naina Shergill:
She is 23 years old and is also an intern in Sanjeevani. She is best mates with Suhaani, Adhiraj, Sid & Tamana but later on she will start to hate Tamana and Sid. Even though she don't like Dr.Yuvraj but still finds him everytime near her. Maybe that's what is called Love. She will be the only one whom Yuvi will trust with eyes closed.
Dr.Siddhant Modi:
He is 25 years old and is an intern in Sanjeevani. He is also the cool dude and is best mates with Tamana and everyone else except Yuvi but ater on will become friends for little while and then turn into enemies. Has feelings towards Tamana.
Dr.Tamana Gupta:
She is 24 years old. Best mates with Naina and Suhaani. Likes Yuvi and is friends with him as well. Has got somekind of feelings towards Sid but can't figure out what they are. Starts to hate Naina later on.
Dr.Suhaani Malik:
She is 22 years old and is sister of Yuvraaj. They both have got a dark past and they both hate Dr.Shashank. Loves Adhiraj and knows that his brother knows him well and is very close to Naina whom she considers his sister-in-law from her heart. Is also an intern in Sanjeevani.
Dr.Adhiraj Shergill:
He is 25 years old and is the brother of Dr.Naina. He knows that Naina loves Yuvi so he and Suhaani are on a mission to make both of them realize their love. He knows that Yuvraj will keep Naina happy. He knows why Suhaani and Yuvraaj are in Sanjeevani and he knows their past as well.