It's starting to become more clear what happened:
The daughter died and in their grief the parents adopted a look-alike.
The grieving brothers resented this fake and bullied her, often cruelly.
Young Hari never told the parents, tried to be a 'good child' because she was a child herself and had her own fears.
One year later the parents died.
The brothers already grieving, spiraled.
Hari's life was a nightmare for many years.
From the first chapter though i'm gonna make some assumptions.
As the brothers grew up themselves and matured, they regretted their actions.
However, it was too late to make amends for lifelong cruelty so they were at an impasse.
Hence, the confusing scenes in Chapter 1 about the bro being upset that Hari wanted to marry and leave so much and watching over her from the door.
Y'know it would be interesting if Hari time-traveled due to the Brother's wishes because she clearly had no desire to repeat anything.