For 60 years, the group of detectives known as "Detective Office 5" has raised the bar for detective work. The agents of Detective Office 5 are a group of stellar detectives lead by the genius code breaker Detective 507. When an unknown client enlists 507 to crack his most difficult programming code yet, the detective embarks for Shanghai where he crosses paths with a sniper, an informant, the head of the Blue-Dragon Mafia, and beautiful singer on the run, Meilan. As 507 stumbles deeper into a twisted quagmire of intrigue he discovers the sad truth behind the mystery.

A four-part anthology in the spirit of The Twilight Zone, this film starts off with a group of commuters stranded at a train station in the rain, listening to stories told by one of the group. These include tales of a group stranded in the mountains and haunted by guilt over a death they inadvertantly caused, an emotionally broken chessmaster pressed into playing a real-life game for an eccentric millionaire, a wandering medieval samurai who finds a modern-day cell phone on the ground and a person on the other end asking questions about the past, and a young couple who agree to try a computer simulation of what their future as husband and wife would be like.