The Debt of Gratitude

Three hundred years ago, Shen Jinghan's ancestor saved Qingwu's life. According to the fox clan's contract, she must repay the Shen family's kindness over three lifetimes at the cost of three fox tails. Once the debt is settled, the contract is automatically dissolved. If she unexpectedly achieves nine tails, she can directly become an immortal. What does fate have in store for her? — Description from novelcodex.org