The second step toward the ten trainees' debut, Group Mission with SM Hits! Which mission songs among numerous SM hits are given to SMROOKIES and the ten trainees? Revealing the whole process of team selection, practice.

The rankings for the second mission get announced amid tension; who are the top four that will get the second benefit with the two SM ROOKIES members?

The trainees continue with the missions without any room to breathe. The third gateway to their debut, Group Mission with SM Hits in Japanese. SMROOKIES and the 11 trainees practice day and night after receiving even more difficult mission songs.

Launching the last unit of NCT; revealing the debut process of idols; who will be selected to debut with Smrookies in the new NCT unit?