Over 50 years ago, a 19-year-old man named Liu fell in love with an 29-year-old widow named Xu. Because of the age difference they were not able to be together so they fled up a mountain and lived life out of a cave. There was no electricity or water in the cave, but the two made it livable.
Liu began carving a staircase that would take over 50 years to complete and consist of over 6,000 steps so that his wife could comfortably go up and down the mountain. The couple was living in total seclusion until a group of adventurers was going through the forest and came upon the staircase.