I Pay My Mortgage with Years of My Life

After dying from working 996, I am reborn on the day before I sign my mortgage contract. I thought I could avoid a life full of rotten luck, but unexpectedly, I get bound to the "Loan Spirit" System. "Congratulations! You've received a discounted loan: one million, payable over thirty years. Each month, you need only pay with 'one year of your lifespan' or complete one 'supernatural mission' to make your payment!" Looking at my parents' hopeful faces and my girlfriend's dream of getting married, I grit my teeth and sign. At first, I think the missions are just pranks targeting the neighbors, until the first one tells me to... spend three nights sleeping in a morgue. That's when I realize this mortgage really has to be paid with my life.