Undercover H.S.(The devastating truth)Ep.21

Undercover HS{The emperor's lost gold}EP.01

Undercover H.S.(Byeongmun HS)EP.02

Undercover H.S.(Spooky stories)EP.03

Undercover H.S.(Almost)EP.04

Undercover H.S.(Ghost story riddles)Ep.05

Undercover H.S.( Fight for what is right)Ep.06

Undercover H.S(Joining the student council)Ep.07

Undercover H.S.(The clock)Ep.08

Undercover H.S.(Student council)Ep.09

Undercover H.S.(Threat)Ep.10

Undercover H.S.(Hye Seong's father's notebook)Ep.11

Undercover H.S.(Time-off)Ep.12

Undercover H.S.(The 24th anniversary of Byeongmun High School)Ep.13

Undercover H.S.(The involvement)Ep.14

Undercover H.S.(The plan for VIP students)Ep.15

Undercover H.S. (Connection)Ep.16

Undercover H.S.(The mathematics teacher)Ep.17

Undercover H.S.(Crucial clue)Ep.18

Undercover H.S.(Retribution)Ep.19

Undercover H.S.(Try again)Ep.20

Undercover H.S.(Revelation)Ep.22