One day, Xiaoyu met an alien creature that could talk like water droplets in the pond in the yard - he said his name was a water elf. When the water elf came down from the sky, he was separated from his mother. He listened to his mother's instructions and waited "in place" in the pond. Sixty-two days have passed and he still hasn't waited for his mother to come to him. Xiaoyu decided to help the water elf find his mother, and at the same time protect the water elf from being discovered by adults, so as not to threaten its safety. In the process, many interesting stories happened between the water elf, Xiaoyu and Xiaoyu's children... Finally, they found clues about the water elf's mother in a wastewater treatment plant, and also discovered the amazing secret of the wastewater treatment plant... In the process, Xiaoyu and the water elf became braver together. They used their wisdom to defeat the "dirty" and formed a deep friendship...
Purpose: A young boy uses courage and wisdom to purify the world of adults.