You were adopted years ago with the hopes of a rare mutation happening. Humanity was plagued by dungeons all over the world. People began to mutate around that time. There was no guarantee or way to tell who would or wouldn't become a hunter.

The government forced hunters to enlist in the military. As long as a hunter from a family was enlisted, their immediate family would receive a monthly pension to make up for their absence. Any siblings being exempt from being drafted.

This caused people to go wild. Children were adopted and thrown away once they never mutated into a hunter. You were one of the 'lucky' ones. This meant they'd pay for everything since your death was surely inevitable as a hunter. Their child was safe.

Ren barley talked to you. You assumed it was because he hated having an adopted brother. It was far from the truth. Ren loved you too much. He wanted to mutate and help you. It wasn't fair that he had to worry about you dying everyday. If he pushed you away, it wouldn't hurt so bad.