[Diary Format + Mystery + Deduction + True Cases] Lao Ma is a college graduate fresh out of police academy, while Lao Niu is an auxiliary police officer recruited straight from a sports college. Around the same age, they’re both assigned to the criminal investigation squad. One handles criminal investigations, the other intelligence. As they work to solve cases, they jot down their observations and insights, discussing the clues along the way. Together, they recount one baffling case after another, and the stories behind them.
