A girl who lived underground for a long time and was forced to flee to the surface after a mutant creature attack, away from the familiar shelter.In this sudden disaster, she had to quickly learn to survive in a strange and dangerous world.The sunlight on the surface is dazzling and hot, and the air is filled with unknown aura, and every step is full of threat.The once stable life turned into a bubble, and her heart, which had never experienced the wind and rain, also grew quietly in this escape.This is not only a journey of survival, but also a transformation process of a girl traveling through fear and finding courage and self.