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Season 1, Episode 4: The Secret
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Bong-seok's secret is exposed and Hui-soo walks him home. Frank searches for his third target.
All Episodes - Season 1
Episode 1
Senior Year
Episode 2
Booyang: Family Support, Levitation
Episode 3
1+1
Episode 4
The Secret
Episode 5
Recall
Episode 6
Bungaeman
Episode 7
The Stranger
Episode 8
Black
Episode 9
Humanists
Episode 10
The Monster
Episode 11
Romanticist
Episode 12
Partners
Episode 13
Jang Ju-won
Episode 14
The Idiot
Episode 15
N.T.D.P.
Episode 16
The Man Between
Episode 17
Awakening
Episode 18
South and North
Episode 19
Final Battle
Episode 20
Graduation Day