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MC makes it to the actual castle! Ain is Ian and he has a half-sister. He's a terror to his sister (she wants to be Lord, but her parents chose the older brother- she was 10/11 when they died). She blames the brother for their deaths and he thinks of her as paranoid, despite him telling her some really messed up things and him not seeming to have emotions.
He also is neglecting and making MC feel like they're crazy and bad for having boundaries and desires. The "don't touch yourself" and "southerners cheat" continues. Seemed like a lot of "if he did so-and-so, I'd kill him" or shot death dreams.
He has been drugging MC every night in the mansion and continues in the castle. Molests him in his sleep a couple times...
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The coach letting off too far away in the beginning was him. If michel made the wrong choice, Ian was set to kill him (him choosing the suitcase- kill him / (michel wanted to run away with Ain, but actually run away together?- kill him / etc.)
Ian actually saved his house as he bought and stole mines and got rich. His house only didn't fall to ruin because of him. I can imagine that he set up Michel's house to fall - not part of what I've read yet though, but it'd be on brand.

Read the translated novel as far as it goes... Red flag remains for a while