The Startling Bell had a peculiar effect, an artifact gifted to the Scarred Woman and the man with double pupils by the train conductor.
Its effect was to confirm the passenger's identity and determine the level of danger they posed.
The more dangerous the existence, the more urgent the sound emitted by the Startling Bell, which helped the duo survive many crises. This was also one of the reasons they dared to seek out the "passengers."
Since they could already estimate the level of danger posed by the target, they could effectively avoid running into a dead end. This allowed them to search for targets among the "passengers."
Of all the players they met during their journey,
the most dangerous one was a seemingly ordinary security guard in a shopping mall in a certain city, which made the Startling Bell sound urgently.
He must have been a high-level expert above LV10. This made them not dare to linger and quickly leave the city.
