Synopsis：Song Chuwan, born an illegitimate child, was locked in a basement since childhood. She was forced to ghostwrite for her older sister, helping her maintain the image of a talented woman. When her sister couldn't conceive, Song Chuwan was made to sleep with her brother-in-law in her place. Determined to break free from her sister's control, she turned the situation around by seducing her brother-in-law and exposing her sister's lies.