The second mission is the "Concept Mission". The songs are revealed and the trainees are divided into different teams, each group being led by one debut trainee. EJ's team receives a disappointing feedback in the interim check; they also travel to Busan and go to a seiro-mushi restaurant before their performance to spend time off and discuss ways to improve.

After the mission for Round 3 is revealed, the 15 trainees get together in their teams to practice. They must pick a leader and choose a team name. The groups work together through practice and interim checks while getting closer. SEVENTEEN delivers a special mission to the trainees where there will be a "variety contest" to give them a chance to earn additional &BALLS. The trainees go outdoors to a lodge where they open up to each other and talk about what has been on their minds. They also receive surprise special messages from afar.