Martial Arts in a Troubled World: It Starts with Peeping at the Neighbor's Sister

[Invincible][Super Cool Article][Decisive Killing]
Daqian Wuguo, this world has heavy rain, thunder and lightning, scorching heat, and people are living in poverty. There are also gangs, aristocratic families, sects, and princes who are separatist and trying to win over the world's resources.
Xu Hua traveled through time and became a low-level miner. He was hungry and cold, and his life was harder than a dog's.
One night, his neighbor's sister was taking a bath, and he took a peek and fell to the ground.
When Xu Hua woke up, he found that he had obtained a one-click upgrade system.
Others practiced a martial art for three years, but he only needed one second to upgrade.
Others practiced a martial art, but he could master hundreds of martial arts.