Kim Ji Soo
Go Bok Dong
Support Role
Cha Sun Woo
Hong Sang Tae [Ah Ran's classmate]
Support Role
Kim Tae Hoon
Do Jeong Woo [Teacher]
Support Role
Go Soo Hee
Han Gong Joo [Kang Ja's best friend]
Support Role
Im Hyung Joon
Oh Jin Sang [Kang Ja's husband]
Support Role
Kim Hee Won
Ahn Dong Chil
Support Role
Oh Yoon Ah
Joo Ae Yeon [Chairman Hong's secretary]
Support Role
Park Young Gyu
Hong Sang Bok [Chairman / Sang Tae's father]
Support Role
Jeon Gook Hwan
Park Jin Ho [No A's father]
Support Role
Park Geun Hyung
Kang Su Chan
Support Role
Yoon Ye Joo
Jin Yi Kyeong [Ah Ran's best friend]
Support Role
Kim Ji Young
[Kang Ja's mother-in-law]
Support Role
Park Soo Young
Wang Jeong Hee [Ah Ran's classmate]
Support Role
Seo Ji Hee
Hwang Min Joo [Ah Ran's classmate]
Support Role
Park Hee Jin
Kim Shin Ja
Support Role
Kim Byung Chun
Oh Dal Bong [Myung Sung High School headmaster]
Support Role
Kang Moon Young
Do Yoon Hee
Support Role
Seo Nam Yong
Sang Man [Gong Joo's subordinate]
Support Role
So Hee Jung
Jung Hae Jin [Yi Kyung's mother]
Support Role
Yesria
Ahn Tae Hee [Ah Ran's classmate]
Support Role
Jung Shin Hye
Lee Hwang Song [Grade 2, class 3]
Support Role
Yoon Sang Hoon
Go Bok Soo
Support Role
Jang Yoo Sang
Oh Geun Soo [Ah Ran's classmate]
Support Role
Kim Young Sun
[Oh Geun Soo's mother]
Support Role
Yang Jae Jin
Psychiatrist
Support Role

Lee Yong Jin
['Three musketeers' taxi driver] (Ep. 1)
Guest Role
Lee Jin Ho
['Three musketeers' taxi driver] (Ep. 1)
Guest Role
Yang Se Chan
['Three musketeers' taxi driver] (Ep. 1)
Guest Role
Kim Kwang Gyu
[Kang Ja's homeroom teacher] (Ep. 2)
Guest Role
Kim Young Chul
[English teacher] (Ep. 8)
Guest Role
Joo Jin Mo
Hong Man Bok [Office of Education Chief] (Ep. 10, 12)
Guest Role
Kim Young Hee
[Gangnam mom] (Ep. 11)
Guest Role
Park Seon Woo
Lawyer Oh
Guest Role
Kang Tae Sung
Prosecutor Jung
Guest Role
Kim Seo Ra
Han Mi Joo [Sang Tae's mother]
Guest Role
Lee Jong Goo
Teacher Kim [Restaurant owner]
Guest Role
Kim Gi Cheon
Jeon Hyung Shik [Ex-deputy principal]
Guest Role
Hong Seung Beom
[Anchor]
Guest Role
Kang Samuel
[Lawyer]
Guest Role
Park Sook Myung
[Neighbor]
Guest Role
Ahn Sang Tae
[Ex-teacher]
Guest Role
Lee Sang Hoon
[Gym teacher]
Guest Role
Lee Chae Yoon
[Crying mother]
Guest Role
Shim Hye Yun
[Baby in stroller]
Guest Role
Jung Kyung Soon
[Kang Ja's mother]
Guest Role
Park Young Soo
[Construction worker]
Guest Role
Heo Dong Won Guest Role
Hong Boo Hyang Guest Role
Park Won Ho Guest Role
Lee Yu Ju
Oh Ah Ran [Young]
Guest Role

Kim Hyun Jun Unknown

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