At the Purification Society, those in custody hunt down sins to earn pure thoughts. Anyone near the bottom of the rankings will be struck from the rolls and turned into an "empty shell," their consciousness trapped forever in the Sin Realm.
Xu Yandong doesn't want to owe anyone anything, so he always works alone: taking jobs alone, entering the Sin Realm alone, and making it out alive alone.
Until he discovered a fake core, pieced together from countless ash-core fragments, in an underground Sin Realm beneath an old goods market in the south of the city.
That's where it all began.
Theme: In a desperate situation where they have to face death alone, they choose each other. It's not that they're unafraid. They're just more afraid of being alone. It's not that they never part. Even after they've gone their separate ways, they are still willing to find each other again.
