- Lee Hye-ri (Sung Deok-sun)
- Ryu Jun-yeol (Kim Jung-hwan)
- Park Bo-gum (Choi Taek)
- Go Kyung-pyo (Sung Sun-woo)
- Lee Dong-hwi (Ryu Dong-ryong)
- Ryu Hye-young (Sung Bo-ra)
- Choi Seong-won (Sung No-eul)
- Ahn Jae-hong (Kim Jung-bong)
- Kim Seol (Sung Jin-ju)
- Sung Dong-il (Sung Dong-il)
- Lee Il-hwa (Lee Il-hwa)
- Kim Sung-kyun (Kim Sung-kyun)
- Ra Mi-ran (Ra Mi-ran)
- Choi Moo-seong (Choi Moo-seong)
- Kim Sun-young (Kim Sun-young)
- You Chea-myung (Ryu Jae-myung)
- Lee Min-ji (Jang Mi-ok)
- Lee Se-young (Wang Ja-hyun)
- Bae Yu-ram (Mr. Yoo [Assistant manager])
- Lee Cheong-mi (Bo)
Reply 1988 — S1E4
Episode: Can't Help~ing
Air Date: 2015-11-14
Runtime: 75 min
Overview
Deok-sun declares she wants to get into college, Seong-gyun nurses hurt feelings, and Taek deals poorly with losing.