The purple sand beach is like a forgotten dream, hiding the secret of the end of the world. In this eerie secret realm, Zi Heng - known as the "Backlight Walker" by the wanderers - embarks on a journey of exploration alone with her obsession with her father's mysterious disappearance. She has the "Sand Spirit Bloodline" and can sense the rhythm of the deep purple sand, but she has also been involved in the thousand-year dispute between the beach and the old gods of the deep sea. Walking along the waves, Zi Heng allies herself with the superpowers and becomes the enemy of the sand beasts. Her blood and sweat are intertwined, eager to ignite the long-dormant will of the sand at the moment of breaking through the shackles of fate. Every step challenges the limits of human nature, and every fight shakes the boundaries of the ancient world. Under the purple sand, is it the remains of his father or a god who has never awakened? Only the burning courage can write the legend of Zi Heng in the depths of the secret realm.