On October 19, 'Master Key' shared the lineup via their official social media page. Along with the fixed members (Lee Soo Guen, Jeon Hyun Moo, Wanna One's Kang Daniel & Ong Seung Wu, and Henry), TWICE's Sana, WINNER's Song Min Ho, NU'EST W's JR, GOT7's Jinyoung, EXO's Chanyeol, SHINee's Key, and actress Lee Sun Bin will be joining the 4th episode. 

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'Master Key' is a game variety show where the cast members must use logic, psychology, and clues to find out which players hold the Master Key.

The first episode aired on October 14. The show airs every Saturday at 6:10 p.m. KST.

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