Yoo Ho-jeong
Na-mi

Shim Eun-kyung
Young Na-mi

Jin Hee-kyung
Choon-hwa

Kang So-ra
Young Choon-hwa

Koh Soo-hee
Jang-mi

Kim Min-young
Young Jang-mi

Hong Jin-hee
Jin-hee

Park Jin-joo
Young Jin-hee

Lee Yeon-kyung
Geum-ok

Nam Bo-ra
Young Geum-ok

Kim Sun-kyung
Bok-hee

Kim Bo-mi
Young Bok-hee

Min Hyo-rin
Young Su-ji

Kim Si-hoo
Young Joon-ho / Joon-ho's Son

Park Young-seo
Young Jong-ki

Chun Woo-hee
Sang-mi

Kim Hye-ok
Na-mi's Mother

Jeong Seok-yong
Jong-ki

Ha Seung-lee
Ye-bin

Kim Yeong-ok
Na-mi's Grandmother

Baek Jong-hak
Nami's Husband

Jung Won-joong
Na-mi's Father

Kim Won-hae
Teacher

Kim Sae-byuk
Class Monitor

Kang Rae-yeon
Jong-ki's Girlfriend

Kim Ye-won
Girls' Generation Leader

Ryu Hye-rin
Girls' Generation Member

Lee Kyung-young
Joon-ho

Bae Soo-kyung
Gang High School Girl

Park Soon-cheon
Woman in Past Picture

So Hee-jung
Homeroom Teacher

Cha Tae-hyun
Insurance Company Main Model

Lee Jun-hyeok
President of Private Detective Office

Han Seung-hyeon
Jung-mi's Older Brother

Yang Hee-kyung
Jang-mi's Mother

Ju Jin-mo
Sung-chan

Go Joon
Private Detective

Kwon Eun-soo
School Broadcasting Club DJ

Choi E-sun
Joon-ho's Friend

Sung Ji-ru
Choon-hwa's Lawyer

Eom Hye-soo
Sang-mi's Group

Ahn Soo-ho
Judge

Yang Joo-ho
Insurance Company Branch Manager

Lee Sang-ah
Woman in Past Picture