The three Lu sisters once deeply loved Gu Chengming, but their affections gradually shifted towards Shen Huaichu, the son of their nanny, due to his "life-saving favor." On Gu Chengming's 22nd birthday, the sisters collectively stood him up to take care of Shen Huaichu. Heartbroken and disillusioned, he impulsively married Yu Zhiyu, a woman he had met only once.