Nam Ji-hyun

as Park Jin-ju (Blue Bird on the Desk)

Jung Jin-an

as Ma Jin-ju (Blue Bird on the Desk)

Kwon Eun-soo

as So Young (U and Me)

Oh Ji-hye

as Chul Goo's Mother (U and Me)

Park Bo-young

as Hee So (Relay)

Son Eun-seo

as Gyu Ri (Relay)

Sung Ji-ru

as Teacher (Blue Birds on the Desk)

Moon Sung-keun

as Vice Principal (Relay)

Jung Yu-mi

as Health Teacher (Relay)

Kim Mi-hui

as (Relay)

Choi Won-tae

as Choi Young-chan (Girl on the Run)

Choi Yo-han