Her sister's death left an indelible shadow on her. Six years later, her mother died. She could no longer feel any warmth in this home. When she was left with nothing to miss, she discovered her sister's secret. It turned out that her sister's death was not an accident. So she decided to make mistakes and find out the cause of her sister's death. It turned out that it was good and not good, and it was evil and not evil. . . .