Characters Cha Jin-wook
The son and illegitimate child of Chairman Cha of Chasel Medic.
Designated as the successor, Jin-wook transfers to Cheongdam International High School. With his striking looks and brilliant mind, he rises to the top of the Diamond 6 and solidifies his power.
He appears arrogant on the surface, but he is a complex individual who saves Jena from a crisis while also leaving a door open for Yul-hee.
He devises secret schemes to prove his own existence.
Baek Jena
The Queen of Diamond 6.
She faces a crisis as her weaknesses, including her parents' divorce and her stepmother Min-hee's pregnancy, are exposed. Despite the shaky succession line and conflict with her friend Yul-hee, she refuses to yield, recruiting Hye-in into Diamond 6 to restore her standing.
Though she secures a foothold for power, cracks begin to form in all her plans due to the revelations by 'Blackdog'.
She may look cold and intimidating on the outside, but inside, she is fragile and warm-hearted. Still, she will not break. She refuses to let anything be taken from her.
Min Yul-hee
A member of Diamond 6.
On the day of her engagement party, Yul-hee's world collapses when the relationship between Woo-jin and Kim Hye-in is revealed by her most trusted friend, Jena. Enraged, Yul-hee turns from friend to foe, stopping at nothing to find Jena's weaknesses.
She continues her assault by attempting to seduce Jin-wook. Even though Kim Hye-in—whom she pushed off the roof—returns alive, she instead tries to use her to bring down both Hye-in and Jena.
Obsessed with revenge and completely darkened, she is no longer the Yul-hee of the past.
Kim Hye-in
A new member of Diamond 6, though she entered Cheongdam International High School through the Equal Opportunity admission program.
She is mocked by the other students for being from the 'low-income' bracket. Through a deal with Jena, Hye-in becomes the first 'dirt spoon' member of Diamond 6.
The sweetness of power, luxury goods, and college admission benefits change her more than guilt ever could. She doesn't want to back down anymore. She wants to protect this position at all costs.
Seo Do-eon
The King of Diamond 6.
After his father steps down as chairman, Do-eon is pushed out of Diamond 6 by Jena. He tries to stay by the side of his girlfriend Hye-in, who suffers from memory loss, but he falls into confusion and shock as she changes into someone he doesn't recognize.
In the process, he faces the ignored truth and the fact that his father, Hee-soo, covered up the incident. Deciding not to be a bystander any longer, he resolves to be honest about his feelings for Hye-in and clarify his own path.
Park Woo-jin
A member of Diamond 6.
He was supposed to be engaged to Yul-hee, but the situation is on the verge of breaking because he slept with other women, including the 'low-income' Kim Hye-in.
Lee Sa-rang
The youngest member of Diamond 6.
He naturally joined Diamond 6 upon entering Cheongdam International High School as a freshman. He fell in love with Hye-in at first sight.
