An epitome of bad luck, Kim Jae Hwa, has been told “an unlucky hussy” since her birth. Jae Hwa committed to life more than anyone, but nope! Try next life! Goddess of luck dodges her. One day, she’s struck with panic disorder. When the doctor tells her about medication, she feels resentful. "I did nothing wrong" To people who hurt her, she decides to reciprocate with not more, not less, but just the same amount of pain she received. Will the life of Jae Hwa, an "oddinary" woman, finally blossom?

Swimming instructor, Young-eun is a single mom raising her 7-year-old daughter, So-hyun. However, a series of tragic events happens as So-hyun's puppy falls from the apartment and dies, and So-hyun bullies other kids in school. Despite her mom's earnest efforts to address So-hyun's mental disorder, her peculiar behavior persists. Twenty years later, Min, who works in handling unclaimed deaths, meets a new colleague, Hae-young, and they form a close bond. However, as Hae-young warmly integrates herself into Min's life, Min begins to feel uncomfortable and suspicious about her intentions.