Shen Gu was born with a "karma account book" and could see all the debts in the world - who owed whom a life, who owed whom a love, who owed whom three hundred years of life, all were written clearly.
With this account book, she has prospered in the world of immortality: she asked debtors to protect her from lightning disasters, made her enemies suffer curses for her, and asked the head of a sect to pay off three hundred years of usurious loans for her.
Everyone thought she was the chosen one with unlucky luck.
Only Shen Gu herself knew - on the last page of her account book, there was a debt she could never repay:
"Shen Gu, I owe my life to heaven and earth. Deadline: eighteen years overdue."
In her previous life, she was a sacrifice to heaven and should have died on the altar.
But she didn't die.
So heaven and earth are coming to "collect the account".