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Twelve contestants begin their 7-day journey. The first match is nothing like what they've expected — it's time to get those brain cells working!

The results of the first match have everyone shocked. Someone from the losing team must go to jail. When the next match begins, conflict starts brewing.

It's day 2, and people are eager to form deeper alliances. This time, the match will result in the very first elimination. Who will be sent home?

The group grows emotional over the result of the first elimination. Meanwhile, a contestant happens upon a secret hidden by the Devil.

The ORBIT alliance or a new alliance? While the contestants rethink their loyalties, someone commits an act of betrayal during the main match.

A betrayal leads to an unforeseen elimination. Emotions flare among the remaining players, but in this prize match, they must work as a team.

It's day 4, and a group commits a fatal mistake. As their allegiances waver, other contestants come closer to unlocking the Devil's secret.

The contestants struggle to solve the Devil's secret. During the fifth main match, Lee See-won attempts to face off against ORBIT.

The competition takes a new turn due to one player's surprising move. Shortly afterward, the truth surrounding the move is revealed.

The secrets of the prison result in a painful night for some. The last main match of the competition commences. Who will move on to the next round?

Contestants give it their all in the main match, but only three emerge triumphant. The last prize match begins.

The 7-day journey is nearing the end, and it's time for the final match. Who among the remaining two will be crowned winner?