I hope the novel and manga have different ending... That less make her happy

Do you have spoilers? If yes please heeelp

In last time i read in novel is going more sad... For her ending... But i hope she gonna reincated again because i don't think the author gonna make him end the novel like that

His Lil sister is her half sister from his father,... And his mother is really her mother she just genuinly don't like his real daughter