Transmigrating as Lin Ruhai's Cousin

She was Lin Ruhai's cousin. They grew up together, childhood friends who were practically engaged. She thought that, having lived in the twenty-first century in her previous life and knowing so much about this world, she could change her own fate and the fates of those around her in this life. Unfortunately, she was wrong. She had been too confident in him, and too confident in herself. She could only hope that it wasn't too late to change things.