JANG FAMILY
Father, late 70s: don't think I'll ever give him a name but we'll see
Anthony (never "Tony"), early 50s: first and only child with Father's first wife (also unnamed); on the outs, faffing about, delving deep into esoteric psychology
David ("Dave"), late 30s: first child with Elizabeth; divorced father of two, noted substance abuser, and known for having botched several major deals; has an intense relationship with Father
Mark, mid 30s: second child with Elizabeth; terminally single, whorehound, and slavishly loyal to Father
Jessica ("Jess"), early 30s: third child with Elizabeth; running her own company, possibly connected to the idol industry; still comes running back when Father calls
Hailey, teens: first child with Claire; currently in Japan
Joshua ("Josh"), teens: second child with Claire; Father is trying to figure out where he screwed up with the others and attempting to not make those mistakes with him; it'll work this time, surely
Wife #1: first wife, old money; may or may not have lost her marbles at some point
Elizabeth: second wife, older money; probably from the pre-quirk era; very distant parent
Claire: third wife, middle-class and American-born, ran into Father at a company function and somehow managed to enthrall him enough to get him to put a ring on it; has enough backbone to fight back against Father and win sometimes and not have him try to ruin her like he tried to ruin Elizabeth; is noticeably a decent human being

Notes: They all have Korean names since the company is traditionally based in Korea but has been drifting more and more to the US, hence the adoption of English names.

ASTUTE GROUP
Main business is semiconductors, but also manufactures electronics in-house and is branching out into tech, hence Dave's deal-botching
Separate business lines include department stores, a Korea-focused news conglomerate (news, advertising, entertainment), foodstuffs, and financial services (insurance, wealth management, sales and trading, investment banking)