Soobin has always felt like he was fading into the background-a quiet soul in a loud world. But on his 5th birthday, his worst fear becomes reality. People stop seeing him, his voice becomes a distant echo, and even his own reflection vanishes from mirrors.
At first, Soobin believes it's a strange and cruel accident. But when he encounters a mysterious girl named Crystal, who shares his plight, she reveals the truth: they are victims of The Vanishing Hour, a supernatural phenomenon that targets those who feel unseen or forgotten.
Crystal has been living in the shadow of this curse for two years, and she knows the terrifying price it demands. The Vanishing Hour draws its victims into a parallel realm where shadows whisper, memories unravel, and those who succumb are consumed by the void forever.
As Soobin and Crystal fight to reclaim their existence, they discover that escaping the curse comes at a terrible cost. When the final hour strikes, one of them must sacrifice their chance to return to the world for the other to survive.
In a heartbreaking twist of fate, Soobin is faced with an impossible decision: save himself and let Crystal vanish into obscurity, or surrender his own life and leave her behind in a world that will never remember him.