Responses
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IIRC his parents died. He specifically mentioned his grandfather, which is even more concerning because why couldn't he have been raised by him?
He most definitely is obsessed with A, though. I daresay what he's doing is even stalking A by showing up where A least expects it/to have some control over him. It feels extremely manipulative and icky.
So, his bio mom and dad whose in his whole life became a deadbeat parents suddenly want to have connections because they want heir to their conglomerate family, and he take thay so that he can condoned his feeling towards his adopted sibling, who in his whole life and since the birth IS HIS SIBLING.
He throws away his job, and his loving family who raised him, just for love?
Nah, that's my friend, isn't love anymore. That's obsession.