In that the male lead sister hates her grandfather as she holds him responsible for her grandmother's death. Later through a flashback it is shown that the male lead is actually responsible for the grandmother's death, when the kids were small the grandmother was really sick and on a life support system, the male lead as a kid was playing with a ball and it hit the life support machine and it got switched off (something like that happened I don't exactly remember). Only the grandfather had seen the truth (I guess the male lead mother also knew the truth unit sure about her) but they hid that and announced to the other family members that the grandfather had decided to switch off the life support system.
Since no one is trying to clear Karthik's misunderstanding what if Karthik is accidentally responsible for his mother's death.
I know too much speculation, but I don't get why no one is trying to tell Karthik the truth or to clear his misunderstanding, they are all waiting for Naira to do all the work.
I had posted this in the AT but Mira asked me to post it in the main forum so everyone can give their views. So let's think of reasons why no one is trying to clear Karthik misunderstanding.