Once again

Betty Nelson was set up by her twin sister Izzie Nelson and caused to have a one-night stand with the heir to the Ziegler's, and she was pregnant with quadruplets. Izzie Nelson took advantage of the situation, took one pair of children, and turned out to be the fiancée of the heir to the Ziegler's. Betty thought that the other pair of twins were dead and was left to take her remaining two children abroad. Five years later, Betty returned and swore to avenge the deaths of her two children. Thus, she learned the truth...