SM is tired off their idols who cant stop with complaining about everything. That's why all the idols need to calm down, take a break and temporally leave the showbizz. They are force to live without managers, fame and money. the idols from various groups have to go undercover. Nobody, literally nobody outside the company may know about this especially the paparazzi and the fans. If they cannot live without following the rules or if the paparazzi and fans know about this, all of them have the consequences off being fired.

Lee Soo Man had not random chose some people, no. They are or better said where related to each other in a way. but tend to deny or rather decided to forget everything. Because every person in the showbizz got 2 faces, one for the public and one that is hidden.