Black Dog
Seo Hyun-jinGo Ha-neul
Ra Mi-ranPark Seong-soon
하준Do Yeon-woo
이창훈Bae Myeong-soo
이윤희Lee Seung-taek
김홍파Byeon Sung-joo
Ye Su-jeongYoon Yeo-hwa
조연희Kim Yi-boon
정해균Moon Soo-ho
Park Ji-hwanSong Yeong-tae
Yoo Min-kyuJi Hae-won
Heo Tae-heeHa Su-hyeon
Woo Mi-hwaHan Jae-hee
Lee Eun-saemJin Yoo-ra
박지훈Ku Jae-hyun
정택현Hwang Bo-tong
Kim Jung-youngMoon So-nyeo (Go Ha-neul's mother)
맹상훈Go Sung-chul (Go Ha-neul's father)
Kwon So-hyunSong Ji-sun
Park Yu-rimRyu Jin-hee- RRyu Ji-eunGo Ha-neul (young)
Ahn So-RimYang Da-sol
류인아Go Ha-neul [Young]
백은혜Song Chan-Hee
태인호Kim Young-ha
최민Han Se-Wol
이현균Ha-Neul's high school teacher
길해연Young Ha's mother
옥주리Store owner
서정연Ji Yun's mom
김정수Principal Gang
박진영High School Principal
유영복Gangnam High School Principal
오세은Female Student (eps 6)