I'm Looking for a Novel. There Is a Section Where the Heroine Fakes Her Death in a Car Accident and Probably Falls into a River.

I'm looking for a novel. There is a section where the heroine fakes her death in a car accident, probably because her car fell into a river. Before she faked her death, she had two good friends, a boy and a girl. The heroine was a real daughter/fake daughter who was kicked out. She faked her death and became the sister of a big boss abroad.