- Yoo Ho-jeong
- Na-mi
- Shim Eun-kyung
- Young Na-mi
- Jin Hee-kyung
- Choon-hwa
- Kim Min-yeong
- Young Jang-mi
- Go Su-hee
- Jang-mi
- Kang So-ra
- Young Choon-hwa
- Lee Yeon-kyeong
- Geum-ok
- Nam Bo-ra
- Young Geum-ok
- Kim Sun-kyung
- Bok-hee
- Kim Bo-mi
- Young Bok-hee
- Jin-hee Hong
- Jin-hee
- Park Jin-joo
- Young Jin-hee
- Min Hyo-rin
- Young Soo-ji
- Young-Seo Park
- Jong-gi
- Seung-hyeon Han
- Jang-mi's older brother
- Shi-hoo Kim
- Past Joon-ho / Joon-ho's Son (as Shi-hoo Kim)
- So Hee-jung
- Homeroom teacher
- Choon-ha Hwang
- Past Detective
- Kim Hye-Ok
- Na-mi's Mother
- Baek Jong-hak
- Nami's Husband
- Lee Kyoung-young
- Adult Joon-ho
- Kang Rae-yeon
- Jong-ki's Girlfriend
- Jung Suk-yong
- Na-mi's Brother
- Chun Woo-hee
- Sang-mi
- Kim Ye-won
- Girls' Generation Leader
