Dong Jiajia and Dong Leer are twin sisters. Dong Leer chose to commit suicide by throwing herself into the river because of her lover's betrayal. In order to save her sister, Dong Jiajia also fell into the water. However, after a nightmare, Dong Leer lost her life, but Dong Jiajia remembered nothing. Facing her mother and fiancé, she was both familiar and unfamiliar. When she met her twin sister's lover, she felt inexplicable love and hatred. Dong Jiajia is confused about who she is, whether her sister's death was a suicide or there was another hidden secret. When everything is revealed, can Dong Jiajia find her lost love?