The year 3003 AD is an era in which hierarchies are used to divide relationships between people.
The weak emotions and lack of trust between people have made pets the most popular life companions nowadays.
As time goes by, people are no longer satisfied with raising dogs, cats and other pets. Because no matter how animals understand human nature, they still cannot fully understand humans, so "spirit" was born.
"Ling", the name is derived from the word "psychic". It means, knowledgeable about spirituality.
"Spirit" is a human being with animal characteristics created by implanting animal genes into the human body.