This is a future world composed of ordinary people, sentries, and guides. Sentinels are born to protect humans, and guides exist to protect sentries. Special races account for about one thousandth of the world's population. They are awakened as invisible genes in the body, and they have different abilities. Sentinels are born powerful, with keen senses, prone to mania, and guides. His control is slightly stronger than that of ordinary people, his rationality is gentle, and he can most effectively appease the sentry. Their union is the most perfect fit. The mark on their souls prevents them from living without each other. They are loyal to each other and serve as a beacon for each other's souls.
This worldview is the author's favorite setting. It is first established on spiritual union and then integrated into the world, and no betrayal is allowed. The mutual protection hidden deep in the blood of the body is a perfect fit. So modern times are filled with promiscuity and betrayal of a completely different ideal world. The author just hopes to build a perfect world in my mind and share it with you.