Ordinary high school student Bong-seok hides a secret.

Mi-hyun hides Bong-seok's superpowers, but the mysterious incidents on social media make her anxious.

Hui-soo assures Bong-seok that his secret is safe by revealing her own secret.

Jeon Gye-do's past is revealed. The NIS finds out information about Frank.

Frank recalls his past as he eliminates his targets. After Frank's visit, Mi-hyun suppresses her son.

In 1994, Mi-hyun is ordered by Deputy Director Min Yong-jun to get close to and learn about the thought process of black ops agent Kim Doo-sik.

Doo-sik and Mi-hyun grow closer, and Doo-sik suggests that they deceive Min Yong-jun.

Doo-sik shows up at Mi-hyun's apartment with a plan to escape Deputy Director Min for good.

Mi-hyun and Ju-won watch the auditorium video and head to Jeongwon High, while Gye-do discovers Jun-hwa.

Parents and children fight to protect each other. Will this repeated war ever end?