In addition to the fact she’s her real mom, usada construction is also a real as well.
I mean, a construction company is her family business. That why she had a chemistry with Moona because these days Japanese building companies hire a bunch of SEA guest workers due to the lack of domestic workforce (and often overwork them), and she doesn’t mention her dad and eldest sibling who are stereotypical Japanese Yakuza (it’s often the case they have connections with outlaws in order to solve “problems” in their business or doing both job at the same time).
Kiara found it out when she saw the rabbit surrounded by a group of bodyguards and cleverly determined to stay away from her, let alone she met her offline in person.
And her mom, again. While her dad is a type of guy who is just happy as far as his spoiled “princess” is around him, her mom was disciplined to be just meek to her tyrannical husband and his daughter. That’s the reason why she’s talking to her on daughter in honorifics and excessively overlooking her staying home 365 a year and yelling all night long.
You may have noticed the rabbit has a problem with socializing herself and is a bit self-centered. That’s because it was always the society itself that needed to change its attitude when she had a trouble.
Sad story.