Three female friends, who come from totally different backgrounds, encounter enemies that they want to kill.
Gong Ma-Ri (Lee Yu-Ri) is a housewife and she has a satisfying life with her husband and daughter. She learns that her husband is having an affair. Gong Ma-Ri seeks an alternative method to end her marriage.
Chae Hee-Soo (Lee Min-Young) is a daughter-in-law of a chaebol family. Her marriage life is not going very well. She takes care of her mother-in-law, who is physically unwell and suffers from Alzheimer's. Chae Hee-Soo endures her husband’s indifference to her and she also experiences difficulties in becoming pregnant. One day, her mother-in-law gives her a terrifying, but tempting offer.
Yang Jin-A’s (Yoon So-Yi) husband is not a good person. Her husband's death leads her to collect large amount of money from his life insurance policy. With that money, Yang Jin-A is able to live a different life than what she was previously accustomed to. But, Yang Jin-A tries to protect her money and suffers from anxiety that her money will be taken away by someone.