Full Cast

    Blue Birthday (2021)

    Cast Members (7)

    Y

    Yeri

    as Oh Ha-rin

    16 episodes

    YH

    Yang Hong-seok

    as Ji Seo-jun

    16 episodes

    LS

    Lee Sang-jun

    as Cha Eun-seong

    16 episodes

    KG

    Kim Gyeol-yu

    as Do Su-jin

    16 episodes

    JH

    Ju Hyeon

    as Kim Ui-yeong

    16 episodes

    KY

    Kim Yi-seo

    as Ji Hye-min

    12 episodes

    LD

    Lee Dong-ju

    as Kim Sin-u

    5 episodes