Black Dog

Seo Hyun-jin

Go Ha-neul

Ra Mi-ran

Park Seong-soon

하준

Do Yeon-woo

이창훈

Bae Myeong-soo

Lee Yoon-hee

Lee Seung-taek

김홍파

Byeon Sung-joo

Ye Su-jeong

Yoon Yeo-hwa

Jo Yeon-hee

Kim Yi-boon

정해균

Moon Soo-ho

Park Ji-hwan

Song Yeong-tae

Yoo Min-kyu

Ji Hae-won

Heo Tae-hee

Ha Su-hyeon

우미화

Han Jae-hee

Lee Eun-saem

Jin Yoo-ra

박지훈

Ku Jae-hyun

정택현

Hwang Bo-tong

김정영

Moon So-nyeo (Go Ha-neul's mother)

맹상훈

Go Sung-chul (Go Ha-neul's father)

권소현

Song Ji-sun

박유림

Ryu Jin-hee

Ryu Ji-eun

Go Ha-neul (young)

Ahn So-Rim

Yang Da-sol

류인아

Go Ha-neul [Young]

백은혜

Song Chan-Hee

태인호

Kim Young-ha

최민

Han Se-Wol

이현균

Ha-Neul's high school teacher

Kil Hae-Yeon

Young Ha's mother

옥주리

Store owner

Seo Jeong-yeon

Ji Yun's mom

김정수

Principal Gang

박진영

High School Principal

유영복

Gangnam High School Principal