After uncovering the possibility of a mole within the NIS, Hae-sung becomes increasingly distrustful of those around him, causing him to question the mission's integrity. Meanwhile, Soo-ah exposes a secretive scheme within the school that guarantees top grades for VIP students. As the web of secrets deepens, Hae-sung uncovers the connection between the gold bars and Chairwoman Seo, prompting him to vow to end her sinister plans.

To everyone's shock, Seo Myung-joo returns to the school. Unimpressed by Hae-sung, she expels him and demonstrates her power by dismantling his team. However, refusing to back down, Hae-sung and the team, including Soo-ah and her mother, devise a daring plan to infiltrate the school once more to retrieve the hidden gold bars.