First you need to understand father of the mc is a good guy in the canon ( main story / plot ) so don't truly hate him and for the sake of the story author made him seem as a bad person from the start so just to let you know .. .Not bad writing quality story development is in steady pace.character design is also okay .. I would not say it's fantastic / awesome but it's not bad . ( acceptable) world background is the same as we know with a little bit of twist .. it feels like mc didn't reincarnate in the mha world but different version of it with many different things from og Mha ( my hero academia )and obviously there's cultural stuff and mc has take responsibility for the family while his father is way.
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LIKETBH, i really hate when fan-fic does this. I read one fan-fic where the mc make advance on the mother of a heroine, then later, author keep villainizing the father of those heroine, making them gay, ruining happy family etc, while justifying the mc only helping the lonely wife. Cheating is cheating, and trying to justify it doesn't make thing better.