Gao is a theoretical centre-back who has supported his team inconspicuously and led them to victory. But when his contract was up for renewal, the adult world awaited him, ruthless and merciless... I don't sign people I can't afford". What is the value of a footballer? 'To score goals'. No, there is more to football than goals alone. New value in football. This is the story of a man who aims to become the world's most profitable footballer.