[Traditional infinite-world style + mild horror + no System + no romance + not a power fantasy + neither saintly nor dark]
In this world, anyone whose wish is granted through one of the Seven Deadly Sins will receive a train ticket. They must then board a train with no final destination and get off at the station printed on the ticket, where they are meant to go. If they make it out, they will receive a return ticket. Otherwise, they will be trapped there forever.
When Shen Du was twenty, he received a letter from his father, who had been missing for ten years. Inside was a train ticket.
Some say it is a punishment for the greedy; others say it is a reward for the brave.
But for Shen Du, it was his eighth deadly sin.
