At the beginning of the Hongmeng, Hengsu was born in the world. He was in charge of the origin, cause and effect and reincarnation of the world, and determined the destiny of all things. No one was allowed to deviate from the established destiny.
In the ancient Lingxu, there were two great disciples of Dao Zun at the beginning of the Yuan Dynasty. Zhilan was in charge of the order of life and the cause and effect of the fate book; Chuwu guarded the Lingxu and was in charge of the order of the punishment sword. Tao Zun gave the Star Fetters a bond of fate, making the two souls connected and sharing weal and woe.
The two of them accompany each other day and night, they share the same affection and support each other, and their bond is far beyond any bond in the world. This unique contract power transcends the causal factors of balance and is regarded as a variable of heaven and earth.
In order to maintain order, Hengsu banned the memories of the two and set up endless reincarnation disasters, causing them to meet, fall in love and separate from each other in life after life, and suffered the pull of fate.
After many ups and downs in many lifetimes, the two have never let go and their hearts are always bound. In the end, they both broke through the fateful trap, broke free from the shackles of reincarnation, and joined hands together to reverse the fate and break the shackles of the Star Fetter Deed. Together they fought against the supreme Hengsu and fought for their own way back to the rest of their lives.