After My Conquest Succeeded, I Realized I Had Conquered the Wrong Person

Gu Tinghe, a professional transmigrator into a book, receives her final mission: successfully complete the conquest of the villain and keep the sect safe. But once the mission begins, Gu Tinghe has no System and doesn't even know who her conquest target is. She can only identify the male lead by relying on the fact that male leads are immortal. Yet just when the conquest seems to have clearly succeeded, the sect is still massacred, and her boss suddenly appears, claiming that he was the one she was supposed to conquer...