Hae Seong and the team grow increasingly concerned that Su A's suspicions could threaten his undercover mission. However, Hae Seong defies the odds and successfully gains a spot in the student council. With this new role, his focus shifts to unraveling the mystery behind the old clocks. Meanwhile, a shadowy figure emerges, threatening to expose Hae Seong's true identity.
해성의 정체에 대한 수아의 의심은 깊어만 간다. 괘종시계를 조사 중이던 해성에게 미지의 인물로부터 충격적인 전화가 걸려오고...
