Song of The Sky Walkers

Reading manhua Song of The Sky Walkers at manhua website.

Summary:

In the midst of an auspicious sign from the heavens, the emperor’s family gave birth to a special pair of twins—a male born with a forehead mole the color of cinnabar and a female born with six fingers.
However, this brother and sister pair is cruelly separated by fate!
One is taken eastward to celestial Penglai to embark on the long road of cultivation.
The other is abandoned in the reeds to travel alongside an old swordsman through the mortal realm…
As fate advances, how will the two fight destiny? Will they be able to reunite?

Bù Tiān Gē / Song of the Sky Walkers / 步天歌