I Owe Billions in Debt to the Point Where I Have No Choice but to Become an Immortal

He owed 310,000 spiritual stones. Heaven told him: If he doesn't repay within seven days, he will suffer a financial disaster. The debt collector told him: If you don't hand over your spiritual roots within three days, you will be destroyed physically and mentally. The sect told him: You are a waste, accept your fate. Lin Mu only said one sentence: "There's something wrong with your account." Seven days later, Tianji Pavilion went bankrupt. Thirty days later, Tiandao Bank changed its surname. A year later, the ancient mythical beast called and asked: "Mr. Lin Mu, the debt in your name has covered the entire fairy world. When will the repayment be arranged?" Lin Mu took a look at the account balance: "When I'm in a good mood."