I Am the Daughter of a Vicious Fake Daughter

I was born into a wealthy family, my mother was the daughter of the richest man, and my father was a young man in the business world. I should have been rich and prosperous all my life. Unexpectedly, the fact that my mother was a fake daughter was discovered, which made the real daughter crazy and stupid. My life plummeted and everyone despised me. My mother couldn't bear the blow and had a car accident. Before she died, my mother held my hand and told me over and over again that she had never done anything to harm the real daughter. I believed in my mother and vowed to find the murderer who framed my mother and my real daughter.