The moment Hyeseong’s older sister, who is involved in the development of the mobile game called Sky Islands, completes the first test play, the Earth is destroyed. As Hyeseong opens his eyes, the world of Sky Islands unfolds before him. From now on, he is no longer Hyeseong but Phinence Bledian. Hyeseong, who can’t even feel a hint of emotion, transforms into a figure who holds the fate of a monarch. He must ascend to the Sky Islands to uncover the hidden secrets of himself and the world, no matter what it takes.