10,000x Rebate System: Every Return Makes Me Stronger

Amon was transmigrated into another world.Unfortunately, he didn't become a handsome prince or some legendary genius.He became a fat eighteen-year-old with terrible physical stats and an absurd amount of mana trapped inside his body....Until his system came.[Universal System Activated.][Full System Access Restricted.][Requirement for Unlocking: Marriage.]Amon was speechless.'Why the hell did his System require him to get a wife?'But things became even stranger after he accidentally fulfilled the requirement.[Wife Registered.][10,000× Return System Activated.][Genuine investment toward your wife detected.][Calculating Return...]Give his wife a powerful cultivation technique?He could receive an even stronger one!!Help her increase her strength?He could gain something even more powerful in return!!The more his wives grew, the stronger Amon became.What started with an embarrassing marriage to the academy's famous Ice Queen soon became something far beyond what Amon had expected.After all, if the world considers them worthless, then Amon will invest everything into them.And collect 10,000 times the return!!