'Queendom Puzzle' released Ep.0, the preview of the highly anticipated idol competition show.

The preview episode introduced the female idols competing for the crown and revealed a new system adapted by 'Queendom Puzzle' - the idols will be ranked into four different tiers. 

In the new show, each female idol will be graded according to their performance: 50% of their points will be from the number of times they ranked number 1 on a music program, and the other 50% will be from the total first-week album sales number.

In this preview episode, the girls were already divided into four tiers as they entered the stage, and the viewers could see the rankings of the contestants even before the competition began.

'Queendom Puzzle' has already generated a lot of buzz among K-pop fans, who are eagerly awaiting the premiere, which will begin on June 13.