The Secret 1 Season 4 Episode

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