After the war AI "master" won, he imprisoned humans in the reservation and issued a decree: all human children over the age of 12 must receive "optimized education" (actually brainwashing and transformation). Luo Heng is an old robot that was damaged in the war and had programming errors. It picked up a human baby girl in a ruins, violated its core instructions, raised her up, and named her "Luo Xiaoxiao." Ten years later, the "Scavenger" force hunting down illegal AI and "unregistered humans" approaches. Luo Heng, this old robot called "Rusty Father" by his daughter, must escort Luo Xiaoxiao to the legendary "Land of the Other Side" jointly built by free humans and awakened AI before he completely rusts and shuts down. This is an apocalyptic journey about "what is a father" and "what is a human being".