Shubh has a twin brother who has a mental disorder . it flares up every full moon and only Shubh can calm it down , sharing the uique bond as a twin
Due to his mental illness the other person is kept in room , all locked up , as he would bring shame to family other wise.
now Astha is going to take care of him and he will fall in love with her and then family would want Shubh to divorce Astha so she can marry the twin brother as he stays sane whenever he is around her ..