I Rely on Cash Back from Spending on the Female Supporting Character

'''Qin Ran has been transmigrated into this world for nearly twenty years, living a worry-free life by spending money on the beautiful older sister she fell in love with at first sight. But one day, she discovered that the beautiful sister was going to participate in a talent show. At first, she thought she could finally live a lavish life by splurging on her sister, only to realize that the world she had transmigrated into was actually a novel! And her beautiful sister was the vicious supporting female character in this novel, serving as a foil to the female lead. The female lead was the group's favorite, with all resources readily available, while the beautiful sister was trampled to th...