This is the Chinese counterpart to the Korean variety show "Crime Scene". In this show, participates have to find who is the murderer among them in a mock crime scene. Later seasons feature some episodes with real locations or completely built sets, which leads to more immersive environments like the "Great Escape".

Both are investigation related shows with very similar production styles. The main cast is very similar between both shows. The major difference is that Who's the Keyman investigates non-murder incidences.