Why did female forensic Ran Meiyu of Datang help Ran Yan?

Ran Yan is the only relative in the world. "Datang female forensic" TV series is produced by Youku and Xingge Media, and produced by Xingge Flying Rabbit Culture Media Studio. 32 episodes Ran Meiyu helps Ran Yanshi. Synopsis: Ran Yan thanked Ran Meiyu for saving herself in court, knowing that she must have a purpose. Ran Meiyu only knew that Master Ran was dead and kept calling her name before she died. Ran Meiyu also took out Master Ran's tablet and claimed that her father had left before she realized that she only had one relative in this world.