If you are expecting an investigative game show à la Busted, The Truth, Girls High School Mystery Class, etc., don't. If you are looking for a thrilling adventure à la The Great Escape or The Zone, also don't. This doesn't even come close, either in format or execution, to any of those shows. This is more of a boring version of X-Man. The cast comes together to eat (yes, EAT. In every. freaking. episode.) and plays two games over the course of the show that has NOTHING to do with the actual case or its investigation, to have clues fed to them and they then have to guess who amongst them is the spy. Then the show will go into an anticlimactic expository sequence where they reveal the half-assedly built case to the viewers. That is it. That is the entirety of it. Yoo Jaesuk, Cha Taehyun, Nara, and Yang Sechan do as much as they can to add some comedy but this show is so dead that even they cannot save it. So have some mercy on yourselves and look for something else. Or just rewatch the aforementioned shows if you cannot find anything. Much better than what this show will ever be.