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Na Moon-young, the woman who has everything: work and love. One day, her husband, Cha Sung-jae, who went to work as usual, disappears. Suspicious people are looking for him. As the truth surrounding her husband is revealed one by one, Moon-young is caught off guard. Everyone who believed in it is doubtful.

The threat to repay the money embezzled by her husband goes awry, and Do Jin-woo, a convicted murderer, hovers around Moon-young. Moon-young is convinced that there is a conspiracy that she doesn't know about, but everyone around her advises her to cover up the incident for the sake of her husband's honor and her daughter.

Moon-young hears that her husband is not only alive, but that he also shot her. Confused, Moon-young hears from Jin-woo the story of Hwang Tae-soo, a homeless man who met her husband the day before he disappeared, and sets out to find his whereabouts.

Sung-jae says he didn't kill anyone. The moment the truth is revealed, and the whole family is in danger of collapse, Moon-young finally decides to protect her husband. She rather sues Ma-kang, demanding 7 billion won in exchange for her dead vocal cords.

Once again, the grueling blackmail against the family begins, and Moon-young takes on an illegal defense. As she steels herself in front of her family's heartbreaking reunion, a surprising truth is revealed.

Moon-young breaks down in front of the evidence sent by Yeon-joo, and to make everything right, she arrests Sung-jae with her own hands. Meanwhile, another secret that will stab Moon-young is revealed.

Moon-young's world has collapsed. Sung-jae and Yeon-joo reveal their hidden true colors. Moon-young discovers that there is a bigger plot behind their evil deeds, and she and Jin-woo prepare a shot to turn things around.

Sung-jae and Yeon-joo are able to easily escape Moon-young's trap after enjoying their victory for a while. Moon-young senses that there was some sort of deal with the embezzlement victim. Meanwhile, a murder case occurs at Yeon-joo's house, and Moon-young falls into panic the moment she sees the suspect.

The deceased Seok-jin appears as a murder suspect after 25 years, and Yeon-joo summons Moon-young's sealed past. In a desperate crisis that no matter what you can do, the trial date approaches, and Moon-young finds herself at a crossroads.

Moon-young chose to attack head on. But Ha Yeon-joo has no intention of stopping here. Ha Yeon-joo is even more furious at Moon-young's choice, and sets her sights on Cha Bom, the last and most precious being to Moon-young.

Moon-young has no hesitation anymore. Moon-young chases after Sung-jae and Yeon-joo as she begins to find herself on the defensive. Jin-woo, Shin-hwa and Inspector Baek become Moon-young’s reliable helpers. However, Yeon-joo's counterattack was not over.

Yeon-joo and Sung-jae board a smuggling ship. Moon-young and Jin-woo chase after them. Unlike Moon-young, who tries to put an end to the evil relationship, Yeon-joo crosses the line and provokes. Moon-young, who believes that she cannot continue to be the same monster, makes her own choice for the last time.