when the sun rises, the moon shines

In order to keep the perpetual city working all the time, the citizens are divided in day shift workers and night shift workers, who break the time rules will be punished by laws.
Day shift workers and night shift workers not just share the same jobs, but also the same capsule apartments because of the lack of resources.
The night shift police HeYi, starts to connect with his mysterious day shift roommate in order to cure his master’s night disease.