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Ordinary high school student Bongseok hides a secret.

Mihyun hides Bongseok's superpowers, but the mysterious incidents on social media make her anxious.

The closer Bongseok grows to Huisoo, the more risk of exposure he draws.

Bongseok's secret is exposed, and Huisoo walks him home; Frank searches for his third target.

Huisoo assures Bongseok that his secret is safe by revealing her own secret.

Jeon Gyedo's past is revealed; the NIS finds out information about Frank.

Frank recalls his past as he eliminates his targets; after Frank's visit, Mihyun suppresses her son.

In 1994, Mihyun, an intelligence analyst at the Agency for National Security Planning, is ordered by Deputy Director Min Yongjun to get close to and learn about the thought process of black ops agent Kim Doosik.

Doosik and Mihyun grow closer as they share their secrets; Doosik suggests that they deceive Deputy Director Min Yongjun and continue with the operation; one day, Deputy Director Min suddenly aborts Mihyun's mission.

A group of innocent teenagers with extraordinary abilities go head-to-head with some of the world's most powerful governments.

Jihee gradually opens up to Juwon, deepening the relationship to reaches they never expected.

Doosik shows up at Mihyun's apartment with a plan to escape Deputy Director Min for good.

After the Black Team disbands, Juwon is offered a mission by Deputy Director Min to revive the team.

Jaeman tries to save his wife with his strength and Juwon is sent in to subude him.

Mihyun and Juwon watch the auditorium video and head to Jeongwon High, while Gyedo discovers Junhwa.

With Mihyun's question, Ilhwan reminisces about his past.

Junhwa attacks Huisoo, and Bongseok awakens his powers to save her.

Mihyun asks Deokyoon where Doosik is, and he tells her what happened in the North.

The fight takes a new turn with the appearance of a new North Korean superbeing, Jaeseok.

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