If You Don't Have Money, What Kind of Immortality Can You Cultivate?

In a "Kunxu Realm" consisting of 36 floors above ground and 18 floors underground, cultivating immortality is no longer a personal practice, but a capital game that requires the investment of a large amount of "spiritual stones" (equivalent to currency). Cultivation of the physical body requires "medication fees", improving mana requires "renting spiritual roots", and learning spells requires hiring "private trainers". The entire cultivation system is monopolized by big forces such as the Heavenly Court. The protagonist Lin Que, a "worker" struggling to survive in the dungeon, awakens to a mysterious system called the "Black Feather Book". This system is driven by an AI supervisor named "Juan Ling", forcing him to perform intense training. However, Lin Que did not choose the traditional path of cultivating immortals. Instead, he used modern financial thinking to develop a "shared training room" and launch "Thunder Tribulation Installment Payment" and other businesses to fight against the monopoly of the immortal sect, and finally revealed the shocking truth that Heaven is actually a "spiritual bank".