(Role: Yeon Si-eun) Real Name: Park Ji-hoon Age: 27 (Born May 29, 1999) Height: 173cm Occupation: Actor, Singer (formerly of Wanna One) Behind-the-scenes personality: Bright and polite. Smiles a lot between takes and is kind to co-stars and staff. Known for switching to a serious expression instantly once in character.

(Role: Ahn Su-ho) Real Name: Choi Hyun-wook Age: 24 (Born January 30, 2002) Height: 181cm Occupation: Actor Behind-the-scenes personality: The mood maker. Often cracks jokes to liven up the set and is close friends with Park Ji-hoon. Takes action scenes very seriously.

(Role: Park Hu-min) Real Name: Go Yun-hwan Stage Name: Ryeoun Age: 27 (Born August 26, 1998) Height: 181cm Occupation: Actor Behind-the-scenes personality: Calm and gentle. Smiles often and gets along with co-stars quickly. A hard worker who gained about 10kg for the role.

(Role: Seo Jun-tae) Real Name: Choe Min-yeong Age: 23 (Born October 9, 2002) Height: 184cm Occupation: Actor Behind-the-scenes personality: Reserved and composed, but very approachable. Laughs a lot on set and has a good relationship with fellow actors.

(Role: Ko Hyun-tak) Real Name: Lee Min-jae Age: 25 (Born 2000) Height: 182cm Occupation: Actor Behind-the-scenes personality: Energetic and cheerful. The type to look out for others during action shoots. Frequently seen chatting happily with co-stars.

(Role: Na Hwa-jin) Real Name: Kim Mu-yeol Age: 44 (Born May 22, 1982) Height: 183cm Occupation: Actor Behind-the-scenes personality: Composed and serious. A kind leader figure who looks after his juniors during filming. Usually smiles a lot and has a good sense of humor.

(Role: Lim Han-lim) Real Name: Jin Ki-joo Age: 37 (Born January 26, 1989) Height: 170cm Occupation: Actress Behind-the-scenes personality: Bright and friendly. A mood maker on set who smiles often. Displays high concentration during serious scenes.

(Role: Bong Geun-dae) Real Name: Pyo Ji-hoon Stage Name: P.O Age: 33 (Born February 2, 1993) Height: 181cm Occupation: Actor, Singer (Block B) Behind-the-scenes personality: Very bright and talkative. Excels at livening up the atmosphere and makes friends with co-stars instantly. Has a bit of a ditzy, natural side.