Because the Elf Clan formed contracts in such a peaceful manner, the federation eventually named this seventh Administrative Planet as Elf Planet.
Yuanen Huihui's father was one of the representatives in those negotiations. The negotiations with the Elf Clan and the inspection of Elf Planet lasted for many years. After his father stayed there, he developed a relationship with a female elf.
The Elf Clan has an appearance similar to humans and very much conforms to human aesthetics. Thus, they naturally became husband and wife. Perhaps influenced by human genes, Yuanen Huihui's mother only required thirty years of pregnancy before giving birth to him.
However, perhaps due to the combination of different species causing a mutation, it was soon discovered after his birth that he underwent a very special change.
In the presence of sunlight, he has a male body, but when night falls, he transforms into a female.