Song Of The Sky Walkers is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

In the vision of the heavens, the emperor’s family gave birth to a special pair of twins—the male born with a forehead mole the color of cinnabar and the female born with six fingers. However, this brother and sister pair connected by blood is cruelly separated by fate! One was taken away by Penglai Xianchang and embarked on the long road of Xiu Xian. The other was abandoned in the reeds, followed by the old swordsman in the red dust… The fated day approaches, how will the two fight destiny? In what way will it be repeated?