This novel was about the protagonist getting dumped by his girlfriend and getting a ring that could create a cosmic weapon. Would he sell it to the country?

The protagonist of the book,"The Soul Formation Ring", was dispirited after being abandoned by his girlfriend. However, he later obtained a ring that could be used to create cosmic weapons. He began to purchase foreign high-tech materials and sold them to the country. I hope you like this fairy's recommendation. Muah ~😗