Ancient Temple at Dusk and Sunset

Shen Du was trapped in an ancient temple. Every time he opened the door, he would return to the same dusk. He tried turning left, turning right, killing someone, committing suicide - without exception, everything reset when the sun set. During his hundredth reincarnation, he saw the words he had carved on the wall: "Don't push that door open." He finally understood that the world outside the door was the eternal cycle of reincarnation, and the temple was the only exit.