Mr. Yoshito Usui said that he created the image of Xiao Xin, because when he observed his children, he found that their ideas were often so unique that the author was attracted by their world.

All children have two sides: smart and naughty. This duality is of great interest to the author. Conversely, the author also embodies this duality in his own works. He also admitted that "Xiao Xin" was partly a copy of himself.

Xiao Xin is a 5-year-old boy who is attending kindergarten. He is precocious and likes to appreciate and chat up beautiful women. At first, Xiao Xin, his father Guang Zhi and his mother Meiya formed a family of three. Later, another stray dog, Xiaobai, was added. Life is frequent and trivial, but there is no lack of warmth.