Wei Jin was an ancestor of the Zhang tribe and one of two men involved in what began the great feud between his tribe and the Gan Jin tribe. The Gan Jin believed that Wei Jin attacked Jin Wei and robbed him of their tribe's sacred crystal orb, while the Zhang claimed that Wei Jin had been heroically returning the orb for a fallen Jin Wei. Upon crossing the border into Gan Jin territory, the former was arrested.
The Zhang believed Wei Jin to be a noble and selfless man. According to their tribe's legend, Wei Jin was leaving the western gate of his village, when he witnessed a man of the Gan Jin tribe, Jin Wei, collapsed on the ground, and stopped to assist him. Jin Wei was transporting a sacred orb, a very powerful relic used in his tribe's Redemption ritual. Wei Jin tried to tend to the man's wounds, but Jin Wei insisted that the orb was more important and asked him to take it back to his tribe. The former promised to send help for the man as soon as he could, but as Wei Jin crossed the border into Gan Jin territory to return the orb, he was apprehended. The Gan Jins sentenced him to twenty years in prison.
The Gan Jin saw Wei Jin as a greedy coward, who was envious of their sacred orb. Their lore stated that during the process of their ancient ritual, Wei Jin knocked the Gan Jin's patriarch, Jin Wei, to the ground as he was approaching the West post of their tribe, and stole the sacred orb.
Aang, upon hearing the names of the two tribes' ancestors, revealed that he knew them and that they were twins. He claimed that when they were eight, they played a game called "Redemption". Jin Wei was running with the ball when he fell, so Wei Jin picked it up and started running to the other end of the field. However, he stepped out of bounds and was put in the penalty box for two minutes. Finally, the tribes reconciled and continued their journey to Ba Sing Se, the Earth Kingdom capital, together, followed by the guide.
Aang later disclosed to Sokka and Katara that the story was completely fictional.