Running Man Episode 395

This week, Ji Hyo is handed a briefcase that is supposed to contain the Luxury Stickers. However, she opens it only to find it empty. While everyone is surprised, a video is played. In the video, three coaches announce that they have the Luxury Stickers and that they intend to eliminate the gold medalist who is hiding among the members. Furthermore, the coaches are among the members as well. If the coaches find the gold medalist first, the Running Man members will be listed for the Shuddering Package. However, if the rest of the members identify the coaches, then the coaches' names will be listed. Who are the mysterious gold medalist and the coaches? (Source: The tvdb)