What's the secret in Zhihu's mobile phone?

The taxi driver saw the environment on his mobile phone and found the secret. The secret in the mobile phone is a novel published by Zhihu Software. Its follow-up is that the taxi driver sees the environment on the mobile phone and discovers the secret. The novel "Secret Zhihu in Mobile Phone" was written by Shen Nian, and the main role is Dong in "xia yang Liuying".