I Am a Son-In-Law in Another World and Become a Martial Saint.

Once traveling through time, Gu Yu awakened the endless wealth transformation system. You can continuously transform your father's money into your own strength. So in this dangerous world of warriors, demons and ghosts, Gu Yu, who was lucky enough to marry the princess, decided to become a son-in-law. Just live on forever! "It's boring to fight and kill, wouldn't it be fun to hang up?" "The enemy is powerful? Directly apply enlightenment to the princess's wife and help her achieve breakthroughs in minutes!" "It is impossible to be exposed. As long as I act swiftly and leave no one alive, no one will know how strong I am!" Time flies, time flies. Gu Yu always had the cautious heart of "my wife comes first when something happens, and I can do it secretly", and lived silently in this crisis-ridden world. Unknowingly, he became the strongest martial saint in the world!