Elegant in appearance, fulfilling in her career.Yet, she struggles with romantic relationships, longing for love. Married to a high-profile doctor, residing in an upscale residential area.Living like a servant, however, she yearns for freedom. Burning with ideals, assigned to the coveted criminal investigations division.But torn by a sense of duty, she seeks justice. Mistress, housewife, detective. Are they enemies, allies, or perhaps— One after another, their secrets and hidden sides are revealed. Cracks begin to form in perfect crimes, and the truth behind the incidents comes to light. Their longing for "ordinary happiness," each envisioned in their own way, drives them to madness. A thrilling suspense.