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. (thetvdb.com)