Fantasy Boys is a global boy band project where 54 boys compete to become members of a new boy band; the boys will be divided into three groups based on their grades.

After the boys' grades are decided, they receive their first theme song; they must master it to be able to either secure their place or advance; the most desperate ones are the boys in grade three as only five of them will be granted entrance.

Producer Woo-young visits the boys to announce the second semester's mission, Visual Mission; the boys choose the themes of their choice among six different costumes and they're given mission songs.

The boys are divided into six teams according to the costumes they've chosen; as they prepare for the performance, some boys show their passion while some of them struggle as they feel pressure; however, the boys are ready to show off their charms.

After surprising results of the 2nd semester rankings, the boys enter their 3rd semester, which they need to compete in the "Position Battle," showcasing their expertise.

The teams take the stage to perform in front of a live audience in the Position Battle round, before receiving feedbacks and their individual rankings.