{Li Ran}, a 22-year-old college student, works a 24-hour convenience store night shift to earn tuition. He unexpectedly discovered that at three o'clock in the morning every day, there would always be special guests in the store - a street singer who could turn into a cat, an alien traveler who lacked energy, a ghostly old man looking for lost things, and the mythical beast Pixiu who protected the city. Li Ran received him with patience and kindness, and the convenience store gradually became a "safe haven" for urban aliens. However, a mysterious "exterminator" suddenly comes to visit. Because his family was accidentally killed by aliens, he vows to expel all aliens. In order to protect the guests he spends his days with, Li Ran musters up the courage to fight, and in the process gradually uncovers the past pain of the Exterminator. He takes the aliens into the world of aliens, allowing them to see the nature of kindness, and understand that urban balance requires people and aliens to coexist. In the end, the hatred dissipated, and the aliens joined the ranks of guardians. The convenience store was still the warmest haven in the middle of the night, and Li Ran also learned bravery and responsibility through experience.
