A decade ago, impoverished but gifted Song Chu was framed by siblings Shen Xiao, Shen Yin, and their accomplices Lu Manman and Cheng Yuan. Though Shen Xiao was tasked with deceiving her, he truly fell for her. Jealous, Shen Yin had Lu Manman push Song Chu down stairs. Presumed dead, Song Chu survived and plotted revenge. Years later, she returns as a cleaner to torment Shen Yin, then schemes to become the siblings' stepmother, exposing past crimes—bullying, elite corruption, and her mother's murder—to make every perpetrator pay.