Heiress Xia Yunshu loses dad, accidentally sleeps with Fu Shenyuan. Cousin Xia Wanqiu frames her for seducing beggar, imprisons 9m. Yunshu births twins, doc secretly gives girl to Wanqiu. Wanqiu poses as Yunshu, fakes pregnancy to claim child. After 5y Yunshu returns with son for revenge.