The glazed building in the center of the city is known as the "Eternal Life Hotel" - it seems to be a high-end life care sanatorium, but in fact it hides the secret that can help people regain their youth and health, but at a price that no one can tell. As long as you sign a thick move-in agreement, you can get twenty-year-old organs and vigorous vitality, but behind this "gift" are the obscure terms of "temporary replacement of body tissue" and "priority disposal rights." The so-called maintenance expenses can be paid off through the exchange of currency, equity, and even unknown value. The city is divided, between the glamorous privileged in hotel towers and the fringes lined with people willing to "invest" in their bodies in exchange for cash or pampering. The legal boundaries are blurred and cannot regulate this hotel, which is so powerful that it has its own ecology. It has already formed a sophisticated set of life loan and repayment rules. Here, health is a commodity with a clear price tag, and every breath is marked with a price. Every "resident" is not only a beneficiary of health, but may also become a "supplier" in this huge cage.