From Slave to King: My Rebate System Built Me a Kingdom With Beauties!

Byung was a man that had no fortunate thing happen to him throughout his time on earth.Right from being born with a disability that limited his body right to his parents dying shortly after and leaving him to fend for himself.He could barely make ends meet and no one wanted to be friends with an invalid.Byung's body got worse as time went on and a thought came to his head."What if I ended it all?"This thought eventually manifested into action as he threw himself in front of a truck, not just any truck but truck kun which made sure the job was done.And without question, his life came to an end or so he thought.Byung was reborn in a world as a goblin, a world with endless possibilities but most importantly, he didn't have the limitation of his disease holding him down.However, he realized he was born into the worst race possible, a goblin.This came with a massive disadvantage but the dual system he awakened showed him that he was brought into this race to lead them to greatness.Byung had one mission, he was going to conquer this world with his dual system.He was blessed with a rebate system, and an evolution system.