Under the Wuhan Changjiang Media Building, all members underwent a "workplace security check." When "temporary worker" Puppy identified two "cow horses," a crisis unfolded. Members sitting next to the "cow horses" would be infected with the "workplace" factor, and only by passing the challenge could they uncover clues to the "cow horses'" identities. Aboard the Wuhan Guqin sightseeing cruise ship, a "letter battle" competition began.