Mnet has released an extended preview for the premiere of 'Produce x 101'!

The teaser video above reveals footage of the trainees on the 'Produce x 101' stage, and they're all surprised to see actor Lee Yoo Jin of the drama 'SKY Castle' appear. He says, "Honestly, my hope is first place. In life, being in the middle is the best, but sometimes you need to be at the top of the pyramid." All the trainees comment they're shocked to see their competition filled with such handsome faces. 

You also get a look at the trainees' dance covers and the host panel and trainer reactions.

Check out the extended 'Produce x 101' preview above!