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Before her parents died in a car accident, they told Su Yan that they had made a mistake in the past and exchanged her with their biological daughter. They had felt guilty for so many years and tried their best to make up for it. They knew they were sorry for Su Yan, but they hoped that because of their friendship over so many years, she would not hate her biological daughter. Everything was their fault. Su Yan had no intention of finding his biological parents, but they came to the door...