In this week's episode, the seven empty heads go on a history tour with Star Lecturer Yu Jae Seok to learn about Joseon Dynasty. With a matching team uniform, the members set off to Injeongjeon in Changdeokgung Palace. After exploring each spot, Star Lecturer Yu will give history quizzes, and those who give correct answers will receive benefits. However, one member with the fewest points will get a penalty. (thetvdb.com)