The Fifth Personality is an asymmetric competitive game developed by Netease. On April 2, 218, the number limit test was started, and on April 12, the whole platform beta was started. The player will play detective Orpheus, and after receiving a mysterious entrustment letter, he will go into the notorious manor to investigate a missing case. In the process of evidence investigation, Orpheus, played by the player, will use deduction to review the case. When reviewing the case, the player can choose to play the supervisor or the survivor and launch a fierce confrontation. In the process of investigation, when it is infinitely close to the truth, it is found that the truth is more and more incredible.

iOS is a mobile operating system developed by apple. Apple first announced this system at the Macworld conference on January 9, 27. It was originally designed for iPhone, and later it was applied to iPod touch and iPad. IOS, like Apple's macOS, belongs to a Unix-like commercial operating system. Originally, this system was called iPhone OS. Because iPad, iPhone and iPod touch all use iPhone OS, it was announced in WWDC in 21 that it was renamed as iOS(iOS is a registered trademark of Cisco's network equipment operating system in the United States, and Apple's renaming has been authorized by Cisco). In January 216, with the release of version 9.2.1 of iOS, Apple fixed a vulnerability that existed for three years. On September 22, 218, Apple secretly added a "trust rating" function based on iPhone users and other device users of the company in the latest operating system.