There is a saying circulating in the mortal world: Twins are eighteen years old. The strong one survives and the defeated one is crushed. From ancient times to the present, any twin in the world, without exception, has fulfilled this passage. Twins will obtain the Twin Secret out of thin air at the age of ten. Those who agree to the duel will live as the winner, and the loser will die. Those who refuse will also have one of them disappear.
This article is an extra chapter of "Twin Life" and tells about some things that happened after the protagonist came down from the mountain.
Conception: