Chen Xing wakes up in a desolate mountain wilderness with no memories, only pain in his chest and a tear still wet on his cheek.
In this modern world that believes in materialism, he keeps seeing things that defy explanation: twisted plants, a humming sound in the dead of night, and bloodstained instruments buried underground. Only one girl believes him and joins him in searching for the truth.
When a mysterious organization calls him the "Key," and a stone door etched with eerie patterns opens in the darkness, Chen Xing makes a choice that leaves everyone trembling.
Only then does he glimpse the truth in fragments of memory:
Perhaps he was never human at all.
And the rules this world believes in without question are slowly crumbling before his eyes.
