Kim Hyun Joong as Baek Seung Jo
Jung So Min as Oh Ha Ni
Lee Tae Sung as Bong Joon Gu
Lee Si Young as Yoon He Ra
Jung Hye Young as Hwang Geum Hee (Seung Jo’s mother)
Oh Kyung Soo as Baek Soo Chang (Seung Jo’s father)
Choi Won Hong as Baek Eun Jo (Seung Jo’s brother)
Kang Nam Gil as Oh Ki Dong (Ha Ni’s father)
Hong Yoon Hwa as Jung Joo Ri (Ha Ni’s friend)
Yoon Seung Ah as Dok Go Min Ah (Ha Ni’s friend)
Jang Ah Young as Hong Jang Mi
Bye Bye Sea as Bong Joon Gu’s followers
Hwang Hyo Eun as Song Kang Yi (Ha Ni’s homeroom teacher)
Song Yong Shik as Song Ji Oh
Moon Hoe Won as Head Teacher Hwang
Choi Sung Gook as Wang Kyung Soo
Yoon Bo Hyun
Abigail Alderete as Chris
Jang Hyuk Jin