Song Joong-ki

as Kang Wu-ju(1 ep)

as Sun Woo-hae(12 eps)

as Self(1 ep)

as Kook-hee

as Vincenzo Cassano(1 ep)

as Loh Kiwan

as Chi-geon

as Self(1 ep)

as Self(1 ep)

as Yoon Hyun-woo / Jin Do-jun(16 eps)

as Park Joo-hyung(1 ep)

as Self(2 eps)

as Vincenzo Cassano / Park Joo-hyung(20 eps)

as Kim Tae-ho

as Eunseom / Saya(18 eps)

as Saya

as Self(1 ep)

as Park Moo-young

as Banker(1 ep)

as Webtoon writer / Jo Suk's friend(1 ep)

as Yoo Shi-jin(16 eps)

as Self(2 eps)

as Wolf-Boy / Chul-soo

as Kang Ma-ru(20 eps)

as Jung Yak-yong

as Narrator

as Self(1 ep)

as Narrator(6 eps)

as Ji-woong

as King Se-Jong [Young](24 eps)

as MC

as Goo Yong-ha / Yeorim(20 eps)

as Dong-wook

as Self – Former Member(830 eps)

as Ahn Kyung-Woo(16 eps)

as MC(1 ep)

as Han Ji-yong(16 eps)

as Host(4 eps)

as Jo Joong-pil

as Handsome Butler(1 ep)

as Yu Jae-hyuk

as Ji Poong-ho(16 eps)

as No-tak

as Jin-ho Jang(54 eps)

as University student(10 eps)

as Reporter(16 eps)

as Self(2 eps)

as Host(1 ep)