Since the beginning of time, the sons of the sun god and goddess take turns going into the sky and providing earth with light and warmth. One day, the sons revolt and all go into the sky at once.
The god Yi volunteers to shoot down the suns to save the earth from burning. The god of the sun agrees.
Yi climbs up a mountain and shoots down all but one of the suns.
When Yi returns to heaven, the sun god is furious. He banishes Yi and his wife Chang O to earth
Chang O is very unhappy on earth so she asks him to go to the jade palace and get the magical elixir which can provide them immortality on earth.
Chang O discovers instead of sharing the elixir and both living on earth forever, she can drink the whole thing and return to her godly self. She does so and instead of returning to heaven, she is sent to the moon