1. The Sinner of the Moon (月宫罪人)
The moon in Chinese mythology is far more than a celestial body—it is a realm of divine punishment, romantic exile, and eternal labor. While Chang’e drifts in lonely immortality and the Jade Rabbit pounds medicines in hope, a third figure toils endlessly in the shadows of the Guanghan Palace (广寒宫): Wu Gang (吴刚).
According to the earliest recorded version in the Youyang Zazu, Wu Gang was a mortal who aspired to become an immortal. He sought instruction from a celestial master and was granted entry to the moon as a disciple. However, Wu Gang was impatient, arrogant, and easily distracted. Every time his master taught him a difficult lesson, Wu Gang abandoned it in frustration and pursued another path. His inconsistency and hubris so enraged the heavenly authorities that they devised a fitting punishment: he would be banished to the moon and tasked with chopping down a massive cassia tree (Gui / 桂). The catch? The moment his axe bit into the trunk, the wound would heal instantly, returning the tree to its original state.
2. The Eternal Chop (永无止境的劳作)
Wu Gang’s labor is the ultimate Sisyphean task. He raises his massive axe, strikes with all his mortal-turned-immortal strength, and watches chips fly. But as he lifts the axe for the next blow, the gash knits itself together, the bark smooths over, and the tree stands whole. He has been chopping for thousands of years. He will chop for thousands more.
The cassia tree itself is a symbol of supreme resilience and nobility. In Chinese culture, the cassia (Osmanthus fragrans) blooms in autumn with intoxicating golden flowers, and its wood is so dense that it sinks in water. The Gui tree on the moon is said to be over 500 zhang high (approximately 1,500 meters), with roots that penetrate deep into the lunar soil. Some versions of the legend say that if Wu Gang ever succeeds in felling it, he will be granted full immortality and released from his punishment. Others suggest that his labor is its own form of immortality—a never-ending meditation on persistence, humility, and the acceptance of one’s limitations.
3. The Third Pillar of the Moon (中秋月宫三重奏)
Together with Chang’e and the Jade Rabbit, Wu Gang completes the mythological triad of the Mid-Autumn moon. Chang’e represents romantic longing and the consequences of choice. The Jade Rabbit represents selfless devotion and the hope of redemption. Wu Gang represents the human condition itself: the struggle against impossible odds, the dignity of persistent effort, and the acceptance that some goals may never be reached.
During the Mid-Autumn Festival, when families gather to eat mooncakes and admire the full moon, they are not merely looking at a satellite. They are gazing upon a living mythological landscape. In the dark patches of the lunar surface, some claim to see the silhouette of a man beneath a tree, axe raised. Children are told that the sweet osmanthus wine drunk on this night is flavored by the blossoms of Wu Gang’s impossible tree—blooms that have never been cut, never fallen, and never ceased to perfume the cold air of the moon.