Main •
Song Yoon-ah as Kim Yoon-jin :An ex-psychiatrist who forgoes her job to become a full-time housewife after the death of her daughter. She was not only a successful doctor, but she became the head of the board of directors to her father's medical foundation. She is extremely dedicated to her son's education, and hires Kim Lisa to ensure her son's admission to a prestigious university. •
Kim So-yeon as Kim Eun-young (Lisa Kim) :A mysterious "surrogate mother" who oversees students' academic endeavors, and help them to achieve the path of an elite. In reality, she takes on the alias of "Kim Lisa" to find someone who was like a sister to her when they grew up in an orphanage. •
Kim Tae-woo as Han Jae-yeol :Kim Yoon-jin's husband. An elite police chief who graduated from the police academy with honors. •
Song Jae-rim as Ha Jung-wan :A homicide detective who is blunt and rash. He is the only person who believes in Kim Yoon-jin's doubts about her daughter's death and helps her find the truth behind it.
Supporting •
Cha Hwa-yeon as Park Sun-ja :Yoon-jin's mother-in-law. Director of a hospital. •
Seo Young-hee as Kang Hye-kyung. :A "Gangnam Mom" who is in constant pursuit of culture and perfection. •
Kim Jae-hwa as Myung Hwa-sook :A senior executive at a large company. Hye-kyung's husband. • Ahn Sang-woo as Yoon Seung-soo :An officer at Ministry of Land Transportation, who quit his job to become a private investigator. Hwa-sook's ex-husband. •
Kim Byeong-ok as Lee Byung-hak • Choi Yoo-ri as Jung Soo-min, Hye-kyung and Suk-hwan's daughter • Song Ji-woo as Yoon Ji-ho, Hwa-sook and Seung-soo's son •
Lee Go-eun as Lee Chae-rin, Ji-ae and Byung-hak's daughter • Son Seung-woo as Shin Se-yeon • Kwon Do-kyun as Min Tae-hwan • Kang Sang-won as Lee Chi-yeol •
Yeon Min-ji ==Original soundtrack==