S1 • E1
Jung In Jae is in over her head when she's assigned to teach the toughest class of Seungri High.
S1 • E2
Nam Soon refuses to tell who really threw the chair through the window.
S1 • E3
After leaving her class to Teacher Kang, In Jae tries to find a way back to the students who don't want her to leave.
S1 • E4
The arrival of a new transfer student threatens Oh Jung Ho's status as king of the hill and holds a mysterious connection to Nam Soon's past.
S1 • E5
In Jae and Se Chan must raise the class GPA on the next midterm, or else the students will be forced attend after-school classes the rest of the semester.
S1 • E6
Chaos erupts at Seungri High when an exam paper is stolen and the pressure of midterms cause Ha Gyung to collapse.
S1 • E7
When Park Heung Soo is facing expulsion, Teacher Jung and Nam Soon try desperately to save him.
S1 • E8
Teacher Jung and Teacher Kang compare teaching methods for a new research class while trying to convince Nam Soon to return to school.
S1 • E9
Heung Soo and Nam Soon are forced to reconcile while doing joint community service. Teacher Kang silently tries to prevent Teacher Jung from getting fired.
S1 • E10
Oh Jung Ho is determined to leave school for good. Nam Soon's guilt over Heung Soo causes him continuous pain.
S1 • E11
Nam Soon volunteers to transfer out of Seungri High instead of Heung Soo. The class feels better off without Oh Jung Ho around.
S1 • E12
The class starts to realize how much they miss Teacher Jung after she's gone. Ha Gyung and Kang Joo's fight escalates beyond expectation.
S1 • E13
Amidst a contemplated suicide, leaked exam questions and an attempted robbery, Teacher Kang sets out to prove Teacher Jung's value.
S1 • E14
Just as it seems Class Two can finally relax and return to normal, a burglary in the class breaks trust between the students.
S1 • E15
The false accusation against Heung Soo for the theft in Class Two is hardly the end as the students continue to accuse each other.
S1 • E16
Teacher Kang tries to distance himself from the students admidst Oh Jung Ho's seemingly inevitable expulsion.
Park Heung-soo
Song Ha-kyung
Shin Hye-sun
Jung In-jae
Kang Se-chan
Eom Dae-woong
Jo Bong-soo
Oh Jung-ho
Im Jung-soo
Kim Dong-seok