Casts
Nam Ji-hyun
as Park 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)
