Record of Youth

Han Ae-sook, Sa Hye-jun's mother

Gateway casting interviewer.

Lee Kyung-mi, Kim Jin-woo's mother

Jung Ji-ah, Hye-jun's ex-girlfriend (Ep.4, 7–15)

Lee Hyun-soo, an actress (Ep. 8–9)

Jin Seo-woo (Ep. 12)

Kim Yi-young, Won Hae-hyo's mother

Won Hae-hyo Noh Young-min as young Won Hae-hyo

Lee Bo-ra, a makeup artist (Ep. 1)

Lee Min-jae, Sa Hye-jun's manager

Sa Young-nam, Sa Hye-jun's father

Kim Jin-woo Baek Soo-min as young Kim Jin-woo

Won Tae-kyeong, Won Hae-hyo's father

Mall visitor (Ep. 14)

Sa Min-gi, Sa Hye-jun's grandfather

Choi Soo-bin, Ahn Jeong-ha's friend and co-worker at the salon.

Lee Hae-ji (Ep. 13)

Charlie Jung, a fashion designer (Ep. 1–2, 10)

Kim Su-man (Ep. 8–16)

Song Min-soo, an actor (Ep. 9–10)

Lee Tae-soo, Hye-jun's former manager and the new director at Park Do-ha's entertainment company