Lin Duoyi got a smartphone from his teacher with APPs that can talk. Each APP has its own character and personality. They seem to be human but not human. With the emergence of smartphones, Lin Duoyi's life has changed from ordinary to ups and downs. The sudden appearance of mysterious roommates, twin beauties falling from the sky, and all kinds of people who look like black organizations come to fight for the phone. What secrets does such a phone hide? . .