NIS agent Jeong Hae-seong (Seo Kang-joon) uncovers a link between the elusive gold bars and Chairwoman Seo Myeong-ju (Kim Shin-rok). As he delves deeper, Hae-seong grapples with trust issues, suspecting a mole within the NIS. Concurrently, Teacher Oh Soo-a (Jin Ki-joo) exposes a scheme favoring VIP students with top grades.