as Su-ho
as young In-soo
as Jong-wook
as Joon
as Joon-young / Ji-geun
as Young Soo-chul
as Han Cheol
as Kang Dong-joo (Young)
as young Jung Sun-woo
as Lee Cheong-san
as young Hong Joo-won
as Ju Dong-myung
as Yi-heon/Kim Deuk-pal
as Ddang-sae (young)
as Seo Young-joo
as Lee Ki Suk (A CIPA patient)
as Gong Woo-Jin (young)
as Seo Young-min
as Young Wang Rin
as Park Ri-Hwan (15 years old)
as young Ryu Tae-oh
as young Lee Jae-hee
as Gong Yoon Tak
as Han Geu-roo
as Ko Min-jae
as Lee Woo Jin
