What does Shi Tian Zhong Kui mean! Why Shi Tian Zhong Kui?

When Zhong Kui was alive, he inherited his ancestral business and was a ghost hunter (similar to the occupation of ancient Taoism). Because of its small name, it is called "ghost catcher". According to legend, after his death, he became an immortal, and continued to be named "Shi Tian" by heaven, responsible for finding out the unjust cases and clarifying them. People also call Zhong Kui and Qin Qiong door gods to protect the safety of houses.