At the end of the Great Yan Dynasty, there was a war on the border and the smell of blood. The protagonist woke up with a headache and received the memory of his original body - Lin Goudan, 16 years old, a border guard, timid and cowardly. He had just been stunned by a barbarian scout. The person who traveled through the world was Lin Yan, a retired soldier of the modern reconnaissance company. See how the protagonist successfully counterattacks
