MEILEE

In the XX universe, people here need to wear a "good colleague" helmet to go to work, and they can't let others see the slightest emotional change and become a "normal person". People here go to and from get off work in an orderly manner, and over time, some robots are mixed in the crowd.
The robot seems to be working all the time without having to go home from work. This society operates like a machine, but the expressions under the helmets are invisible, and some robots with "good colleagues" also have killing intent.