
Just speculations but
Her real father might be Director Baek's brother??!!!
It could be that her mother was engaged to Chairman Shin as expected of arranged marriages but she fell in love with the director's brother which is possibly the chairman's friend along with Aaron's dad... He might've died at an accident or power struggle.... Her getting pregnant when she didnt consummate with the chairman.... And boom, Sera...
I dunno for sure but based on the flashback, she seems to be quite in love with the chairman....
Or it could be the other way around... Like, the director's brother doing the unspeakable (like grape her).... And the director is repaying the guilt through service under the chairman...
I dunno...
He got me hooked there.... It was just a dream... Haist