The 'One Line Sky' in Qinglong Valley is a magical theater of light and shadow. Passing through the sometimes wide and sometimes narrow suspended plank path, deep into the valley, looking up at the narrowest corner, the sky has become a winding thread. If you arrive at (noon 12-14), you will witness a miracle: a beam of sky light pierces through the depths like a stage chasing light, transforming into a flowing and elusive light curtain in the misty water vapor, and the entire canyon is instantly lit up, as if entering a fantasy realm.