Yim Si-wan

as Lee Myung-gi / Player 333

as Self

as Ryu Jin-seok

as Oh Jun-yeong

as Heo Yeom (young)

as Park Jin-woo

as Lee Han-wool / Mantis

as Yoon Jong-woo

as Jo Hyun-su

as Ki Seon-gyeom

as Jang Geu-rae

as ROTC chatmate

as Yim Si-wan

as Ahn Dae-beom

as Min-jae

as merry-go-round man

as Han Sang-yeol

as Hwang Dong-joo

as Jang Byung-tae

as Serenade Man

as Self

as Seo Yoon-bok

as Wang Won

as Club man

as Jung Jin Gook

as Self

as Self

as Self

as Self

as teenage Jang-il

as Yoon Yang-ha / Jang Dong-woo

as Self

as Self

as Self

as Self

as Self - Host

as Ji-baek

as Self

as Lee

as MC

as Self

as Self

as Self

as Self

as Yoon Yi-jun

as Self