Main •
Seo Yea-ji as Lee La-el/Kim Sun-bin : A 28-year-old who is the daughter of a genius scientist. Thirteen years ago, her happy family life was shattered by her father's death. She therefore began to seek and plan revenge for 13 years, starting by targeting Kang Yoon-gyeom, one of the main culprits who orchestrated the death of her father. Unexpectedly, she slowly falls in love with Yoon-gyeom, and thus becomes torn between her desire for revenge, and her feelings for him. •
Park Byung-eun as Kang Yoon-gyeom : The 41-year-old heir of LY Group and So-ra's husband. He falls in love with La-el and has an affair with her, without realizing that this is part of La-el's revenge for her family's tragedy that he and his family had masterminded 13 years ago. •
Yoo Sun as Han So-ra : The 45-year-old wife of Yoon-Hyeon and daughter of South Korea's highest-ranking politician. She is dangerously obsessive about her husband. She is also responsible for the death of La-el's mother. •
Lee Sang-yeob as Seo Eun-pyung : A woman who pretends to be La-el's mother, and an accomplice in her revenge plot. •
Lee Ha-yool as Jang Jin-wook : La-el's husband who loves his wife dearly. He has a close working relationship with Yoon-gyeom. • Kim Si-woo as Jang Bo-ram : La-el's mother, who was loving and caring towards her daughter. She went missing after her husband died. She is later revealed to have been killed by So-ra. But she was also has mental illness and does not believe in taking medication
People around Kang Yoon-gyeom •
Park Myung-hoon as Kang Si-gyeom : Yoon-gyeom's elder brother. •
Lee Se-na as Yoon Soo-jung : So-ra's father and the highest ranking politician of South Korea. He is ruthless and corrupt, and was one of the plotters behind La-el's father's death. •
Jung Hae-kyun as Kim Jeong-chul • Son So-mang as Eun Dam-ri •
Kim Ye-eun as Yeo Ji-hee •
Lee Ji-ha as Chae Ri-sa
People around Seo Eun-pyung •
So Hee-jung as Kim Gye-young ==Production and release==