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Although Cheng Yao had never seen this train as a child, he firmly believed in its existence. As he grew up, he decided that the fairy tale world told by his father was a lie and was disappointed with his father who only knew his job. Cheng Yao and his father became an estranged father and son who rarely communicated with each other. As he continued to pick up his childhood memories, Cheng Yao recalled the close relationship he had with his father, understood his father's unreserved love for him, and gradually recalled his sincerity and bravery as a child. When Cheng Yao wanted to communicate with his father, his father suffered from Alzheimer's disease. Cheng Yao took his father to settle in the town. The father's memory is good and bad, but he always talks about buying fairy tale books for his son. Cheng Yao began to tell his father who had lost his memory the fairy tales he had told his childhood self. As winter turned to spring, on an ordinary day, his father finally remembered the happy train. He summoned the train and took Cheng Yao with him to the infinitely beautiful fairy tale world.