Episode 1
Ordinary high school student Bong-seok hides a secret.
Episode 2
Mi-hyun hides Bong-seok's superpowers, but the mysterious incidents on social media make her anxious.
Episode 3
The closer Bong-seok grows to Hui-soo, the more risk of exposure he draws
Episode 4
Bong-seok's secret is exposed and Hui-soo walks him home. Frank searches for his third target.
Episode 5
Hui-soo assures Bong-seok that his secret is safe by revealing her own secret.
Episode 6
Jeon Gye-do's past is revealed. The NIS finds out information about Frank.
Episode 7
Frank recalls his past as he eliminates his targets. After Frank's visit, Mi-hyun suppresses her son.
Episode 8
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.
Episode 9
Doo-sik and Mi-hyun grow closer, and Doo-sik suggests that they deceive Min Yong-jun.
Episode 10
Ju-won, who leads his gang with his monstrous abilities, is betrayed and becomes a fugitive.
Episode 11
Ji-hee gradually opens up to Ju-won.
Episode 12
Doo-sik shows up at Mi-hyun's apartment with a plan to escape Deputy Director Min for good.
Episode 13
After the Black Team disbands, Ju-won is offered a mission by Deputy Director Min to revive the team.
Episode 14
Jae-man tries to save his wife with his strength and Ju-won is sent in to subdue him.
Episode 15
Mi-hyun and Ju-won watch the auditorium video and head to Jeongwon High, while Gye-do discovers Jun-hwa.
Episode 16
With Mi-hyun's question, Il-hwan reminisces about his past.
Episode 17
Jun-hwa attacks Hui-soo, and Bong-seok awakens his powers to save her.
Episode 18
Mi-hyun asks Deok-yoon where Doo-sik is, and he tells her what happened in the North.
Episode 19
The fight takes a new turn with the appearance of a new North Korean superbeing, Jae-seok.
Episode 20
Parents and children fight to protect each other. Will this repeated war ever end?
