Pemeran Heesu in Class 2

Ahn Ji Ho

as Lee Hui Su

Pemeran Utama

Lee Sang Jun

as Kim Seung Won

Pemeran Utama

Cho Jun Young

as Ju Chan Yeong

Pemeran Utama

Kim Do Yeon

as Choi Ji Yu

Pemeran Utama

Yeon Si Woo

as Cha So Hui [Student from class 4]

Pemeran Pembantu

Baek Na Gyeong

as Lee Jin Hwa (Ep. 1)

Bintang Tamu

Jo Yoon Joo

as Choi Jeong In (Ep. 1)

Bintang Tamu

Ko Kyu Pil

as Kim Jeong Myeong [Earth science teacher] (Ep. 1, 7)

Bintang Tamu

Park Yoo Hyun

as Ji Yeon (Ep. 1)

Bintang Tamu

Kim Yun Ha

as [School bully] (Ep. 1)

Bintang Tamu

Park Jung Yeon

as Dokgo Hui Won (Ep. 2, 4, 7)

Bintang Tamu

Choi Rak Yeong

as [Councelling club member] (Ep. 2)

Bintang Tamu

Sin Ga Ram

as [Councelling club member] (Ep. 2)

Bintang Tamu

Choo Ye Jin

as Song Yu Jin (Ep. 3, 5)

Bintang Tamu

Woo Yeon Seo

as [Cafe owner] (Ep. 3)

Bintang Tamu

Lee Jong Wook

as [Gym teacher] (Ep. 3-4)

Bintang Tamu

Jung Hyung Suk

as [Tennis club coach] (Ep. 4-5, 7-8)

Bintang Tamu

Park Chae Yun

Bintang Tamu

Park Kyung Min

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