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A wandering autistic child was mistaken for his lost biological son by a couple who came from the fairy world to live in seclusion in the mortal world, and took him home for adoption. There is also a girl in their family who is very beautiful and cute. She cannot grow up due to being poisoned, but she is extremely talented. With the boy's various weird behaviors, the couple began to suspect that he was not their biological child, but they were immersed in deep love and refused to admit it...