Transmigrated into a Fantasy World as the Strongest Villain: Awakened the Rebate System

Chu Qiuran transmigrates into the cannon-fodder villain who dies by chapter three. Just as he's about to latch onto the protagonist to save his own skin, a rebate System suddenly activates: give a gift to someone bound to you and get ten times its value back! But the person bound to him turns out to be the protagonist's fiancée, Liu Ruobing! From then on, he becomes a villain who acts like a lovesick lapdog: snatching the protagonist's opportunities to give to his goddess, trading ten-thousand-year-old stalactite milk for ten times as much spiritual liquid, and using a Dao Heart Fruit to scam ten divine fruits. While the protagonist is still struggling to fight monsters, he lounges around earning billions of spirit stones with the System, and even turns a cold senior sister into his personal protection-fee collector. A villain's comeback? No, I'm just an ordinary master of gift-giving.