Main •
Lee Hanee as Jo Yeon-joo / Kang Mi-na •
Kim Do-yeon as young Jo Yeon-joo / Kang Mi-na •
Lee Hwa-kyum as Kang Mi-na after plastic surgery / Kim Eun-jung • Jo Yeon-joo: 33 years old, a graduate from
Seoul National University School of Law, she works at the Seoul Central District Prosecutors' Office. She worked hard on her own to lift her career from the bottom. Because she had to interact with gangsters from various countries, she endeavored to learn how to speak at least 4 languages. She is skilled in martial arts which she uses to subdue gangsters. Because of the harsh environment she grew up in, she developed a strong stamina and strength enabling her to withstand physical assaults that can be life-threatening to others. • Kang Mi-na: 34 years old, youngest and illegitimate daughter of Yumin Group and the second daughter-in-law of Hanju Group. Because of her illegitimate background, her family and her husband's family treat her like a maid. Unknown to them, Mi-na secretly probes their dark secrets to retaliate someday. In order to hide and help Yeon-joo while trying to expose Han Sung-hye, she undergoes plastic surgery and poses as Han Sung-hye's newly hired secretary, Kim Eun-jung •
Lee Sang-yoon as Han Seung-wook / Alex Chang •
Kim Young-hoon as young Han Seung-wook : 36 years old, a third-generation disgraced
chaebol, he is the only son of Chairman Han's late brother and Kang Mi-na's former boyfriend. After being exiled by his uncle, he returns to South Korea to seek the truth behind his father's death and also to find his first love. •
Jin Seo-yeon as Han Seong-hye : 38 years old, a talented businesswoman, she is the eldest daughter of Hanju Group and Kang Mi-na's sister-in-law. An ambitious and narcissistic heiress, she would do anything to get what she wants, including getting rid of people who she believes are standing on her way. When she was younger, she accidentally killed her uncle and hit Yeon-joo's grandmother when she ran away from the factory. •
Lee Won-keun as Ahn Yoo-jun : 32 years old, Jo Yeon-joo's university friend, who comes from a wealthy background and works as a prosecutor at the Seopyeong District Prosecutors' Office. He has feelings for her.
Supporting Hanju Group Family •
Song Won-seok as Han Seong-woon :64 years old, Kang Mi-na's mother-in-law. She often abuses Kang Mi-na. However, when Yeon-joo lives with her, she became the main target of Yeon-joo's insults. One day, Kang Mi-na tells her the truth about her elder son's death. • Song Seung-ha as Han Sung-mi :36 years old, first daughter-in-law of Hanju Group. She is a widow who always feels insecure about her son's future considering the absence of her husband, Han Seong-chan, who was one of the main heir of Hanju Group that was murdered by Han Seong-hye. • Shin Seo-woo as Han Seon-woo :9 years old, Han Seong-chan and Heo Jae-hee's son, as well as the only grandchild of Hanju Group. He is pampered by his mother who wants him to be accepted as Hanju Group's heir even with the absence of his father.
People around Han Family •
Kim Chang-wan as Noh Hak-tae :Jo Yeon-joo's father. He was a gangster who tried to change his ways because of his daughter. He was bribed by Hanju group to confess as the perpetrator of an arson in Hanju Fashion's factory that killed Han Seung-wook's father. Without Yeon-joo knowing, the money was used to pay for her law school tuition fee. • Lee Gyu-bok as Wang Pil-gyu :Han Seong-woon's mistress. She is an announcer for the Nine O'Clock News who got the job solely because of Seong-woon. Kang Mi-na knows about the affair but she keeps silent about it. However Yeon-joo (as Kang Mi-na) harshly humiliated her and Seong-woon. •
Kim Jae-young as Lee Bong-sik :Kang Mi-na's paternal aunt and the President of Yumin Foundation. She wants Mi-na (who is replaced by Yeon-joo) to be fired from being Yumin's president and heiress, even to the point supporting Hanju Group's attempt to acquire Yumin's hotel so that she can get the whole ownership of Yumin group for her own.
Special appearances •
Kim Nam-gil as male priest who leads to heaven. Lee Ha-nee previously worked with him in another action comedy drama
The Fiery Priest •
Jin Seon-kyu as chicken delivery man. Lee Ha-nee previously worked with him in an action comedy film
Extreme Job. • Sung Byung-sook as Yeon-joo's grandmother • Chun-sik ==Production==