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Gu Sui becomes the young madam of the Shang family, but she knows she's only a substitute for the woman Shang Jin truly loves. After one disappointment after another, she decides to leave him. When Shang Jin finally finds her, Gu Sui says, "This time, I'm the one letting you go—because you're not like him anymore." Only then does Shang Jin realize that he was the real substitute all along.