| Director | Gordon Chan |
|---|---|
| Budget | CN¥80 million |
The film is set in 12th-century China during the Song dynasty. The Department Six, a government agency with full jurisdiction over criminal investigations in the imperial capital, is well-staffed and highly disciplined in its operations. Their leader, Bushen, ranks the agents by clearance and dangles the prospect of naming an agent as one of the "Great Four".