Heya @Kavya diii, well I can't say much about Dr Rishab till now he came like a villain without cause, a guy who ran after greed and looked at money as if it was his salvation. A guy who can't skip a chance to earn money no matter which way though don't residents have fixed salary and extra salary for over times like they'll get this much so I don't know how all those tests and all are helping his salary???
But then the matter with his dad, him not asking him to call him son in the premises of hospital, his disregard to everyone on the same standard as him and below him shows he is a materialistic man. Who thinks money is the solution to everything then again this also maybe due to his childhood. I don't think his condition was any better than Sid and so he has seen property as close as Sid and those denied wishes, cravings and everything related has built this man who can't see anything before money and prestige not even family and relationships.
Then his shame on having a waiter as a father can be due to his peers and friend circle in school and college. He maybe a scholarship student and have find friends with rich students who brags about parents and he felt so ashamed introducing his father to those people. He feels ashamed he a doctor has a waiter as a father, a waiter who works in the same hospital as him. He is embarrassed of his father and can't accept him or see his sacrifices and how he is the reason he is a doctor today or there can be some other story too behind his actions.
Still now he is a man who sees his chances to go more up, have more money and build a comfortable life for himself and forget his devastating and embarrassing childhood. He is a good doctor as even Dr Sid mentioned but still not a good human. He is a doctor not a life saver as he is biased and inclined towards his benefits even while treating patient with that rich girl he didn't really try with all his heart diagnosing her problem as her regular visits were helping him but what about the side effects of all the drugs on her body which he prescribed to her. Our DNA is a very volatile thing and all those drugs could easily cause some kind of mutation or other side effect in her body as the binding sites of those drugs will be affecting some hormones or other secretion that our body is producing to relieve her from the pain and all.