Oh Yeon-seo
Joo Seo-Yeon (32 eps)
Ahn Jae-hyun
Lee Kang-Woo (32 eps)
Kim Seul-ki
Kim Mi-Kyung (32 eps)
Kim Tae-hyung
Lee Min-Hyeok (32 eps)
Heo Jung-min
Park Hyun-Soo (32 eps)
Min Woo-hyuk
Joo Won-Jae (32 eps)
Cha In-Ha
Joo Won-Suk (32 eps)
Kim Jae-yong
Joo Seo-Joon (32 eps)
Park Young-soo
Vice principal of Sinhwa high school (9 eps)
Shin Do-hyun
Baek Jang-Mi (7 eps)
Hwang Woo-seul-hye
Lee Kang-Hee (7 eps)
Joo Hae-eun
Lee Joo-Hee (7 eps)
Seo Dong-won
Doctor Kim (6 eps)
Yoon Hae-young
Oh Mi-Ja (5 eps)
Kim Yeong-ok
Chairwoman Han (5 eps)
Jang Yoo-sang
Choi Ho-Dol (4 eps)
Yoon Da-hoon
Kang-Woo's father (3 eps)
Shin Ji-hoon
Park Seok-Min (2 eps)
Kang Tae-oh
Jung-Tae (2 eps)