The third test of the second part of the show is about concept performance and features a mini-mission to form teams. The trainees cover two songs by Seventeen, "Pretty U" and "Hit". They are given one day to practice. The8, Jun, Dino and Hoshi of Seventeen visit the I-LAND to administer the mini-mission themselves, which was won by Team "Pretty U". Kim Sunoo places first and selects his song and lineup for the main mission. The contestants are divided into two units to perform new singles, "Chamber 5 (Dream of Dreams)" as a refreshing concept and "Flame On" as an explosion concept. The producers choose the contestant who will be eliminated based on individual scoring. Explosion VS Refreshing Test (Concept Test) (Release Date: September 11th, 2020)