On July 28, the script reading site was revealed. Later in March Kim Young-jae, Lee Ga-eun, Lee Chae-min and Kim Ji-yoo joined the cast. On March 11, 2021, tvN confirmed that Cho Yeo-jeong, Kim Ji-soo, Ha Joon, Park Se-jin, and Kong Hyun-joo will be appearing in the drama High-class. She fires the signal of the conflict over Song Yeo-ul in the international school (Ep.1) Production But he disappeared and died in a mysterious yacht accident and made Song Yeo-wool fall into a nightmare-like reality as she begins to uncover the secrets he was hiding related to his death. Song Yeo-ul's deceased husband and the representative of an asset management company. Seo Jeong-yeon as Shim Ae-soon, a maid for VIP-only townhouses.Police detective who confronts Song Yeo-ul. Lee Ga-eun as Rachel Cho, a Canadian-born HSC International School teacher ĭirector of Finance, HSC International Schools Foundation Others.Lee Jeong-Yeol as Han Geon-Young in late 50s.She is first-year parent at HSC International School. The youngest member of a group, her husband is a member of the National Assembly. Yoon In-jo as Bang Young-joo, a media group voice actor and media wife.Woo Hyun-joo as Do Jin-seol, the president of the International School Foundation.Restaurant Salon de 愛 co-owner and star chef HSC International School Kwak Sang-geon and Do-yeong's son, HSC International School in G1 Seo Yun-hyuk as Kwak Shi-woo, 8 years old.They were star couple once but now are just a show couple. Na-yoon Hwang's daughter, HSC International School in G1 People around Cha Do-yeong Ī chaebol from the third generation of ventures. Park So-yi as Hwang Jae-in, 8 years old.Lee Chae-min as Ahn Seung-jo, assistant to Nam Ji-seon.Nam Ji-seon's son, HSC International School, in G 9 Kim Ji-yoo as Lee Jun-hee, 8 years old daughter of Nam Ji-seon.Nam Ji-seon's second husband who is a famous cosmetics surgeon in Gangnam Kim Young-jae as Lee Jeong-woo, in early 40s.Jang Sun-yool as Ahn Yi-chan, 8 year old, Yeo-ul's son.He coaches Song's son despite the opposition of other mums. He is very sweet and caring to Song Yeo Wool. Ha Jun as Danny Oh/Oh Soon-sang, an ice hockey player-turned-teacher.she runs Salon de 愛, a restaurant jointly with star chef Jung Mi-do She clings to Ji-seon and tries to become a real celebrity like her. Ī top actress turned celebrity, a former Miss Korea. But she did not reveal her true feelings. It is known that Hwang Na-yoon returned from Hong Kong with a daughter without a husband. Song Yeo-ul's only assistant and CEO of J&Y Gallery. Park Se-jin as Hwang Na-yoon, a single mom.Hotel Locanda President & CEO, HSC International School PTA Parent Representative, she controls public opinion at the international school She was suspected to be murderer in her husband's dissapearance as her husband went missing during a trip on a yacht with only her being on yacht with him all night. Cho Yeo-jeong as Song Yeo-ul, in late 30s, a former lawyer.Cha Do-yeong ( Gong Hyun-joo), a washed out actress follows Nam Ji-seon around because she wants to be in the limelight. Hwang Na-yoon ( Park Se-jin), a single mother who is the only one friendly to Song Yeo-ul. Danny ( Ha Jun), a former ice hockey player is a teacher at the school. Nam Ji-seon ( Kim Ji-soo) is the star among the mothers at the international school where the children of elite go. Song Yeo-ul ( Cho Yeo-jeong) is framed for her husband's murder and she loses everything. It builds the suspense and mystery around those who live it. It is about the fibs and hypocrisies hidden behind the perfect lives of the women who live in the top 0.1 percent bracket of the society.