Transmigrating Into the Strongest Villain in a Fantasy World: Awakening the Rebate System

Chu Qiuran transmigrated into the body of a cannon fodder villain destined to die in three chapters. Just as he was about to cling to the protagonist for survival, a rebate system suddenly activated: giving gifts to the bound person would yield a tenfold return! Who knew the bound person turned out to be the protagonist's fiancée, Liu Ruobing! From then on, he began his sycophantic villain mode: stealing opportunities from the protagonist to give to the goddess, exchanging ten-thousand-year-old stalactite for ten times the amount of spiritual liquid, and tricking out ten divine fruits from the Dao Heart Fruit. While the protagonist was still struggling to fight monsters, he was making billions of spirit stones through the system, and incidentally turning his aloof senior sister into a professional protection fee collector. Villainous comeback? No, I'm just an ordinary gift-giving master...