Oh Yoon-hee: Gender: Female Bae Ro-na's mother. An unlicensed real estate consultant. Close friends with Shim Su-ryeon. Arch-enemies with Cheon Seo-jin. Often feels like an outcast within the Hera Club. Bae Ro-na: Gender: Female Oh Yoon-hee's only daughter. Majoring in vocal music at Cheong-ah Arts High School. Possesses extraordinary talent for singing. A victim of bullying.

Shim Su-ryeon: Gender: Female Joo Dan-tae's ex-wife and mother of Joo Seok-hoon and Joo Seok-kyung. The undisputed queen of the Hera Club, recognized by all residents of Hera Palace. Polite, moral, and considerate. A truly good person. Lives on the 100th floor of Hera Palace. An artist and businesswoman. Joo Seok-hoon: Gender: Male Son of Joo Dan-tae and Shim Su-ryeon. Seok-kyung's twin brother. Majoring in piano at Cheong-ah Arts High School. A flawless, perfect man who excels at everything from looks and academics to fighting. Joo Seok-kyung: Gender: Female Daughter of Joo Dan-tae and Shim Su-ryeon. Seok-hoon's twin sister. Majoring in vocal music at Cheong-ah Arts High School. The cold queen of Cheong-ah Arts High School, devoid of even 1% sincerity or soul. A bully.

Cheon Seo-jin: Gender: Female Ha Eun-byeol's mother. Born with a silver spoon. A famous soprano and the director of the Cheong-ah Foundation. The queen bee of the Hera Club. A psychopath. Married Joo Dan-tae after an affair. Ha Yoon-cheol: Gender: Male Cheon Seo-jin's ex-husband. Ha Eun-byeol's father. Ha Eun-byeol: Gender: Female Daughter of Cheon Seo-jin and Ha Yoon-cheol. Majoring in vocal music at Cheong-ah Arts High School. Mentally fragile and emotionally unstable. A bully. Joo Dan-tae: Gender: Male Father of Joo Seok-hoon and Joo Seok-kyung. CEO of J-King Holdings, an architectural firm. A genius of real estate. A psychopath. Lives on the 100th floor of Hera Palace.

Kang Ma-ri: Gender: Female Jenny's mother. Wife of Yoo Dong-pil. Close with Go Sang-ah but also keeps her in check. Yoo Jenny: Gender: Female Only daughter of Kang Ma-ri and Yoo Dong-pil. Majoring in vocal music at Cheong-ah Arts High School. Arrogant and combative. Lacks skill but is full of greed. Has a crush on Min-hyeok. A bully.

Go Sang-ah: Gender: Female Lee Kyu-jin's wife. Lee Min-hyeok's mother. A former announcer turned daughter-in-law of a chaebol family. Known as the queen of support who would sacrifice anything for her husband and son, but is also a master of gossip. Close with Kang Ma-ri but looks down on her. Lee Kyu-jin: Gender: Male Go Sang-ah's husband. Lee Min-hyeok's father. A specialist divorce lawyer at Victory Law Firm. Successfully entered politics. The only son of a prestigious legal family, he is a hollow, boastful mama's boy. The epitome of pathetic. Lee Min-hyeok: Gender: Male Son of Go Sang-ah and Lee Kyu-jin. Majoring in vocal music at Cheong-ah Arts High School. Plays the role of a bully.

Ma Doo-ki: Gender: Male Music teacher at Cheong-ah Arts High School. Siding with Cheon Seo-jin. Logan Lee: Gender: Male CEO of Logan Lee Corporation and owner of Madison Tower in the US. CEO of Logan Theater in New York. An ally and supporter of Shim Su-ryeon.