The Legend of the Shadowless Sword

In order to seek immortality, the four great masters of the human race jointly arranged an improved Netherworld Formation, trying to forcefully open the Gate of Heaven in order to seek immortality. However, they never expected that what was opened was the Gate of Underworld. For a time, the human world and the underworld world intersected and penetrated each other, and the originally peaceful and stable world faced tremendous changes. The protagonist was originally a person in the real world. Due to the chain reaction of the great changes in the world, he fell into the underworld by chance. He was later transported to the human world and became a young man named Xing Chuping. At this time, the human world is in an early stage of being gradually penetrated by the underworld's forces. As the only human being who has been to the underworld, how will he examine his own existence, and how will he face this troubled world...