Plot: 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, and behind-the-scenes of the trainees who are divided into two groups. Which guests secretly visited SMROOKIES and the trainees, who were practicing for Group Mission with SM Hits hard, and surprised them? The best solo male artist, the master of unrivaled performance and stage themes, TAEMIN of SHINee