Karakter utama

• Ryu Jin - Ryu Jin-haeng - timid announcer
• Lee Ki-woo - Ryu Ki-woo[1]
• Ha Seok-jin - Ha Seok-jin
• Kim Soo-hyun - Kim Soo-hyun
• Jung So-min - Jung So-min[2]
• Siwan - Yim Si-wan[3]
• Choi Jung-woo - Ryu Jung-woo
• Park Joon-geum - Park Joon-geum
• Kim Yeon-woo - Kim Yeon-woo
• Go Kyung-pyo - Kim Kyung-pyo[4]
• Simon D dari Supreme Team - Ssam D[5]
• Kim Ye-won - Kim Ye-won

Karakter sokongan

• Park Eun-ji - Park Eun-ji
• Kim Seung-pil - jurukamera
• Woo Hye-jin - Choi Yoon-hee
• Sa Mi-ja - ibu Jung-woo
• Jung Ga-ram - Jung Ga-ram
• Yeom Dong-heon - rakan Jung-woo
• Ahn Hye-kyung - peguam
• Choi Eun-kyung - presiden syarikat penasihat pendidikan

Kameo

• Park Myeong-su - Ascetic Geosung
• Julien Kang - peminat Joon-geum
• Lee Chae-young - cinta pertama Seok-jin
• Park Se-mi - pelajar sekolah tinggi
• Hyemi - pelajar sekolah tinggi
• Park Mi-sun - Park Mi-sun
• Kim Young-ok - ibu Joon-geum
• Yoo So-young - So-ra
• Hwang Kwanghee - Ha Kwang-hee (ep 76-77)
• Ha Dong-hoon - Rapper H