According to legend, there is the Forgotten River in the far north. Its water is so hot that if you drink it, you will forget your past. On the bank of Wangchuan River lies the huge city of Fengdu. It is unknown how old it is, but it is wild and deserted. The source of the River of Forgetfulness is the Underworld Sea. The Underworld Sea is endless and its source is unknown.
At the beginning of ancient times, the heaven and earth were as chaotic as chicken eggs. Kun was born in the sea of the underworld. His name was Ming. He was one hundred and eight thousand years old. He transformed into a roc and flew with wings. However, he saw a young girl in green clothes. She drained her essence and blood and led thousands of lonely souls into Fengdu. After that, she died of exhaustion. Her soul was extinguished and scattered in the sea of the underworld, unable to enter reincarnation. He fell in love with the girl, and refused to ascend. He traveled around the sea of the underworld forever, looking for the girl's remaining soul.