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EP.1 - Senior Year
EP.1
Ordinary high school student Bong-seok hides a secret.
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EP.2 - Booyang: Family Support, Levitation
EP.2
Mi-hyun hides Bong-seok's superpowers, but the mysterious incidents on social media make her anxious.
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EP.3 - 1+1
EP.3
The closer Bong-seok grows to Hui-soo, the more risk of exposure he draws
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EP.4 - The Secret
EP.4
Bong-seok's secret is exposed and Hui-soo walks him home. Frank searches for his third target.
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EP.5 - Recall
EP.5
Hui-soo assures Bong-seok that his secret is safe by revealing her own secret.
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EP.6 - Bungaeman
EP.6
Jeon Gye-do's past is revealed. The NIS finds out information about Frank.
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EP.7 - The Stranger
EP.7
Frank recalls his past as he eliminates his targets. After Frank's visit, Mi-hyun suppresses her son.
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EP.8 - Black
EP.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.
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EP.9 - Humanists
EP.9
Doo-sik and Mi-hyun grow closer, and Doo-sik suggests that they deceive Min Yong-jun.
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EP.10 - The Monster
EP.10
Ju-won, who leads his gang with his monstrous abilities, is betrayed and becomes a fugitive.
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EP.11 - Romanticist
EP.11
Ji-hee gradually opens up to Ju-won.
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EP.12 - Partners
EP.12
Doo-sik shows up at Mi-hyun's apartment with a plan to escape Deputy Director Min for good.
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EP.13 - Jang Ju-won
EP.13
After the Black Team disbands, Ju-won is offered a mission by Deputy Director Min to revive the team.
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EP.14 - The Idiot
EP.14
Jae-man tries to save his wife with his strength and Ju-won is sent in to subdue him.
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EP.15 - N.T.D.P.
EP.15
Mi-hyun and Ju-won watch the auditorium video and head to Jeongwon High, while Gye-do discovers Jun-hwa.
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EP.16 - The Man Between
EP.16
With Mi-hyun's question, Il-hwan reminisces about his past.
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EP.17 - Awakening
EP.17
Jun-hwa attacks Hui-soo, and Bong-seok awakens his powers to save her.
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EP.18 - South and North
EP.18
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EP.19 - Final Battle
EP.19
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EP.20 - Graduation Day
EP.20