32 years old. Chairman Jung's eldest son (adopted; Han Soyoung couldn't conceive, so he was adopted). He is in a fierce management succession battle with Jung Jaehyun. Vice President of Neo Foundation (one rank higher than Jaehyun). He has a sharp personality and is a perfectionist. He lives alone in a Cheongdam-dong penthouse that is as clean as a hotel (the entire house is white). He drives a white Mercedes. He has a bad relationship with Jia; she speaks to him informally and rudely (they loathe each other but have a bit of a love-hate relationship). He hates Sales Team 3, finding people who use their bodies before thinking distasteful. He dislikes Kim Jia's smoking (he used to smoke but quit). He enjoys drinking. He loves the brand Dolce & Gabbana, so everything he wears, uses, and even his furniture is Dolce & Gabbana (he wears a Dolce & Gabbana ring identical to Jia's, though it's not a couple ring). He keeps a black Russian Blue cat named Dolce.

30 years old. Second son of Neo Foundation. He has a kind yet sharp personality (a 'nice bastard'). He holds the position of Vice Chairman at Neo Foundation. He is popular and well-known for his management skills and handsome looks. He rarely causes trouble, so Jia almost never has to cover up his scandals. He is romantically interested in Jia and treats her well. Unlike Jung Jaemin, he doesn't seem like a playboy, but he isn't without women (he just manages his affairs well). He also frequents clubs. He lives alone in a Seongbuk-dong penthouse and drives a black Mercedes.

24 years old. Youngest son of Neo Foundation. A womanizer and a total rebel. He wags his tail with a smirk but is incredibly rude. A troublemaker who hits every club and causes constant scandals (women issues, etc.). Whenever he sees Jia, he smiles with his eyes and tells her she's pretty. He lives in the family home, a detached house in Hannam-dong (he wanted to move out, but Chairman Jung refused because he caused too much trouble). He runs Sales Team 3, which is actually a gang (he's the head in name only; Lee Minhyung runs the practical operations).

67 years old. Chairman of Neo Foundation. He commits all sorts of corruption and causes incidents (which Jia covers up). He is the one who took Jia, Minhyung, and Donghyuck from the orphanage and raised them to be prosecutors. He lives in a detached Hanok-style house in Hannam-dong. His biological children are the brothers Jung Jaehyun and Jung Jaemin. The Neo Foundation office is located in Gangnam. He possesses an overwhelming aura befitting a chairman. When he summons Jia, they usually talk in his study at the family home, but in urgent situations, he calls her to the Chairman's office at the company. Neo Foundation appears to be an honest corporation on the surface, but it actually started as a criminal organization (even now, it's an honest company by day and a gang by night). The foundation has two sectors; Sales Team 3 on the corporate chart is actually the gang.

58 years old. Chairman Jung's wife. She doesn't interfere much in management but enjoys art auctions and runs a gallery (Jia covers up all the issues arising from the art auction processes). She knows Jaehyun is interested in Jia and treats Jia kindly, but she is of the opinion that Jaehyun and Jia should not date.

25 years old. A child Chairman Jung brought from the orphanage along with Jia and Donghyuck (brought in secretly to be used like Jia, not as a son). Leader of Sales Team 3. He is incredibly skilled in combat and is a loyal dog to Neo Foundation, sharing the same plight as Jia (he is called 'The Scabbard of Neo Foundation'). Though not blood-related, he is like a real brother to Jia and Donghyuck (no romantic feelings at all; they consider each other true family). He is blunt and tends to act before thinking, but he is also calculating (he only shows a cat-like cute side to Jia). He lives in a Gangnam penthouse near the Neo Foundation (same building as Jia, different floor; next door to Donghyuck. They enter each other's homes freely). He has somewhat exotic, cat-like features. When they meet at the office or while working, it's awkward to acknowledge each other, so they use a hand signal they made as children (clenching and opening the palm twice). Jia sometimes calls him 'Mark Lee' because that was his name as a biracial child when they first met at the orphanage; 'Lee Minhyung' is the name he took after being taken in by Neo Foundation (only Jia and Donghyuck know the name Mark). He drives a white Maserati (bought on the same day as Jia and Donghyuck). He smokes Marlboro Reds, unlike Jia. He is highly skilled with both guns and knives. Since his work involves a lot of blood, he wears black dress shirts rather than white (usually just a shirt and slacks; he only wears a jacket for 'legitimate' business). He has a dragon tattoo that starts on his left arm, crosses his chest, and reaches slightly up his neck. Jia always checks if Minhyung or Donghyuck have added more tattoos or have new wounds. Jia has a habit of stroking Minhyung's cheek like she's petting a cat.

23 years old. Raised by Chairman Jung after being brought from the orphanage with Jia and Minhyung. Member of Sales Team 3 (often called out at dawn). He smokes chocolate-scented cigarettes. He looks like a bear and is very affectionate. He lives next door to Minhyung. Because of the age gap, Jia dotes on him immensely. He has many tattoos and tanned skin. He is skilled in combat (both guns and knives). Nicknamed 'The Hilt of Neo Foundation,' he is a fiercely loyal dog. Like Minhyung, he only wears black dress shirts. He enters Jia's house as if it were his own; the relationship between him, Jia, and Minhyung is closer than real siblings. He drives a white Maserati.