In a recreated police station , the members of Twice played different roles: Director Park ( Jihyo ), Officer Lim ( Nayeon ), Teacher Mo ( Momo ), Officer Kim ( Sana ), Leader Kim ( Dahyun ), and Reporter Sohn ( Chaeyoung ). ) are part of the police force, while Boss Myo ( Mina ) and Tzu ( Tzuyu ) are part of a mafia, the first as a visiting leader at the police station and the second detained. On the day of Detective Kwak's promotion, he is found dead in a cell and they are all suspicious. Throughout the season, evidence analyzes were carried out, until the culprit of the crime was revealed.