Answer:
Nothing.
Step-by-step explanation:
It is known that a good credit score generally comes from a history of managing money responsibly. This doesn’t mean you shouldn’t borrow money though; in fact, companies often like to see a track record of timely payments and sensible borrowing. In Leon's case, he has no dealings with credit cards as he makes all his transaction with physical cash; therefore he has no credit score in any way.
Leon has to work towards improving his poor credit score or need to build up credit history from nothing.