Missjih's KPOP-Blog

Main

• Suzy as Go Hye-mi
• Kim Soo-hyun as Song Sam-dong
• Taecyeon as Jin-gook/Hyun Shi-hyuk
• Eunjung as Yoon Baek-hee
• Wooyoung as Jason
• IU as Kim Pil-sook
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Extended

• Ahn Gil-kang as Ma Doo-shik
• Ahn Sun-young as Kang Oh-sun (Oh-hyuk's older sister)
• Ahn Seo-hyun as Go Hye-sung (Hye-mi's younger sister)
• Lee Hye-sook as Song Nam-boon (Sam-dong's mother)
• Choi Il-hwa as Hyun Moo-jin (Jin-gook's father)
• Park Hyuk-kwon as Go Byung-jik (Hye-mi's father)
• Park Hwi-soon as Jin-gook's roommate (ep 1, 2, 5)
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Kirin Teachers

• Uhm Ki-joon as Kang Oh-hyuk
• Lee Yoon-ji as Shi Kyung-jin
• Park Jin-young as Yang Jin-man
• Lee Byung-joon as Principal Shi Bum-soo
• Lee Yoon-mi as Maeng Seung-hee
• Baek Won-kil as Gong Min-chul
• Bae Yong-joon as President Jung Ha-myung (ep 1-4)[11]
• Joo Young-hoon as the composing teacher (ep 11)
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Kirin Students

• Jun Ah-min as Jo In-sung (Jin-gook's friend)
• JOO as Jung Ah-jung
• Han Ji-hoo as Park Do-joon
• Yoon Young-ah as Lee Lia
• Park Jin-sang as Jun Tae-san
• Kim Bo-reum as Ha So-hyun
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Cameo

• Sumi Jo as herself (ep 1)
• Kim Hyun-joong as himself (ep 1)
• Song Hae as variety show host/MC (ep 2)
• Kang Yi-suk as young Jin-gook (ep 5)
• Nichkhun as Lee Lia's CF partner (ep 8)
• Bae Noo Ri as one of Kirin's students (ep 8)
• Koo Jun-yup as himself (ep 9)
• Chansung as Oh-sun's imaginary boyfriend (ep 12)
• Leeteuk as himself (ep 13)
• Eunhyuk as himself (ep 13)
• miss A as flash mob dancers (ep 16)
• 2AM as flash mob dancers (ep 16)
• Dal Shabet as Baek-hee's Kirin students (ep 16)
• Park Eun-bin as 16-year-old Hye-sung (ep 16)