After Being Transformed into Cannon Fodder, I Went Crazy to Repay My Debts

Dressed as the cannon-fodder young junior sister who must die in the book about cultivating immortals, I crazily repaid my debts to survive, and "handed over" all the opportunities that belonged to the protagonist in the original book in advance. I thought I would be able to escape unscathed once I paid off, but I found that the protagonist looked at me more and more strangely - he said that what he wanted most was me.