The Only Way to Reach the Pinnacle of Life Is to Spend Your Lifespan

I thought binding myself to the “Life-for-Power System” meant I could easily grow stronger by spending my lifespan.

Who knew the System would cheerfully prompt me: “Dear customer, your lifespan balance is insufficient. Would you like to apply for a lifespan loan?”

Even more absurd, the loan is issued by the Underworld, the King of Hell is the loan officer, and they even check your credit history across three lifetimes.

Just as I'm debating whether to sign, the System pops up another ad: “Exclusive offer for valued Underworld customers: the deluxe Six Paths of Reincarnation package. Be a noble of the Heavenly Dao in your next life!”

Me: “...”

The next second, I receive a message from the King of Hell himself: “Congratulations! You qualify for a special interest-free loan to ‘Oppose the Heavenly Dao's Tyranny.’ Would you like to withdraw the funds now?”

Behind it all, a vast secret that could overturn the Three Realms seems to be lurking... (After Chapter 20, I really let loose...)