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if u yet open to write this story, i've got an idea.
drowned in crimson
okay so FL is not real daughter rather daughter of twin brother of current father.
and she lived few years with real father, like 4 or 5 or a age where she vaguely can remember him.
the real father was Muslim but didn't die as one, he ended up with mafia and got into main position there. and there he killed a person ordered along with his family, and he did. But he couldn't kill the only child of the now bleeding couple so he left him alive. time skip, the real father married his co partner and had daughter to protect her it was said that she miscarriaged, time skip when the daughter was a year old, that only child of dead couple killed the mother so after 3years sensing danger at his on life, the real father gave his twin and took oath from him to never reveal to her his his real father.
The real father and his twin decided to plan and tell her story that they shifted from old place and lived here with the twin brother and his family.
so that only child killed the real father at 19 while mother when he was 15. and by time he was 30 he had already finished whole organization as revenge yet his gut told his something was a miss and he found it out that the promise of his dead father (flashback, last breath his father told him my child live, and do the same to him xyz)
so after realizing FL-daughter was living in peace while he suffered in past so decided to made her life hell just like his back in those days but won't kill her because he'll do the same what was done to him.
ages and all could be reconsidered based on the story plotline
now the later story progresses and the FL will work alongside ML to sort her life.
lots of love,
zingzingzing
