Kim Tae-ri
Na Hee-do (16 eps)
Nam Joo-hyuk
Baek Yi-jin (16 eps)
Bona
Ko Yu-rim (16 eps)
Choi Hyun-wook
Moon Ji-woong (16 eps)
Lee Joo-myung
Ji Seung-wan (16 eps)
Kim Hye-eun
Yang Chan-mi (16 eps)
Choi Myeong-been
Kim Min-chae (16 eps)
Joo Bo-young
Lee Ye-ji (16 eps)
Choi Min-yeong
Baek Yi-hyun (16 eps)
Kim So-hyun
Na Hee-do (adult) (16 eps)
Park Yoon-hee
Baek Sung-hak (16 eps)
Kim Young-sun
Yi-jin's mother (16 eps)
So Hee-jung
Seung-wan's mother (16 eps)
Seo Jae-hee
Shin Jae-kyung (16 eps)
Lee Ye-jin
Park Han-sol (16 eps)
Heo Ji-na
Yu-rim's mother (16 eps)
Kim Dong-gyun
Yu-rim's father (16 eps)
Lee Chan-jong
Seo Joong-hyuk (16 eps)
Esther K. Chae
Shin Jae-Kyung (English version, voice) (16 eps)
Jung Hyung-suk
Kim Hak-gyu (8 eps)
Ok Joo-ri
Ahyeon Supermarket owner (5 eps)
Park Yoon
Jung Da-yeong (5 eps)
Cho Min-wook
Kwon Dung-uk (5 eps)
Lee Seon-gu
National fencing team coach (4 eps)
Park Jeong-pyo
Yi-jin's maternal uncle (4 eps)
Yoon Se-woong
Seo Yeong-seong (4 eps)
Moon Woo-bin
Kang Ji-soo (3 eps)
Bang Eun-jeong
Lee Da-seul (3 eps)
Jung Chung-gu
Myeongjin Book Rentals owner (3 eps)
Ok Ye-rin
Na Hee-do (young) (3 eps)
Kim Bum-Joon
Ji-woong's friend (3 eps)
Kim Ha-ru
National team fencer (3 eps)
Lee Dong-kyu
UBS Network Sports anchor (3 eps)
Baek Suk-kwang
Na Sung-jin (2 eps)
Jung Yong-ju
Delinquent boy (2 eps)
Lee Jung-ok
Fencing club coach (2 eps)
Ri Min
Newspaper delivery subscriber (2 eps)
Bae Seong-il
Mr. Baek's ex-employee (2 eps)
Kyung Da-eun
Ko Yu-rim (young) (2 eps)
Jo Nam-hee
Taeyang High School headmaster (2 eps)
Seo Jeong-bin
Kim Jong-chan (2 eps)
Yeon Seung-bin
Choi Won-hwan (2 eps)
Jeon Yeong
Yogurt lady (2 eps)
Lee Kyung-oh
UBS Network director (2 eps)
Han Gyu-hyuk
Kang Hak-rae (2 eps)
Garrison Farquharson-Keener
Alan Smith (2 eps)
Ji Yun-seong
Reporter Ji Yun-seong (2 eps)
Shin Yeon-sook
Hee-do's grandmother (2 eps)
Kim Joon-hyung
Sanga University coach (2 eps)
Yoon Tae-yi
Seonjung Girls' High School fencing team player (2 eps)
Yoon Ju-man
PD Park (2 eps)
Lee Si-hoo
UBS Network cameraman (2 eps)
Park Ji-ho
UBS Network documentary staff (2 eps)
Oh Choong-geun
UBS Network staff (2 eps)
Kim Tae-moon
UBS Network cameraman (2 eps)
Jeong Young-do
UBS anchorman (2 eps)
Ji Hyun-woo
Jungle Prince bassist (2 eps)
Kang Sung-hwa
Jungle Prince guitarist (2 eps)
Im Woo-chan
Jungle Prince drummer (2 eps)
Kang Seong-jin
Jungle Prince keyboardist (2 eps)
Park Ki-deok
Lee Gi-hun (2 eps)
Kwon Dan-a
National team fencer (2 eps)
Kang Hoon
Baek Yi-hyun (adult) (1 eps)
Park Jin-soo
Seo Hye-jin (1 eps)
Jung Yoo-min
Hwang Bo-mi (1 eps)
Kim Tae-yoo
Kim Yoo-jin (1 eps)
Lee Ki-bbeum
Bo-mi's friend (1 eps)
Song Young-joo
Bo-mi's friend (1 eps)
Yu Bee
Yi-jin's friend (1 eps)
Jang Yeon-woo
Yi-jin's friend (1 eps)
Lee Ha-joo
Fencing team player (1 eps)
Shin Ga-eun
Jang Chae-hee (1 eps)
Lim Yong-soon
Security guard (1 eps)
Kang Hak-soo
Loen Hotel employee (1 eps)
Park Bu-keon
Mr. Baek's ex-employee (1 eps)
Hyeon Jin
Taeyang High School teacher (1 eps)
Ma Jeong-pil
Taeyang High School faculty member (1 eps)
Jeon Se-yong
Passerby (1 eps)
Yoo Eun-ah
Elephant Snacks diner (1 eps)
Seo Young-sam
Korean history teacher (1 eps)
Jeon Soo-hwan
Mr. Kim (1 eps)
Song Jae-saeng
Ms. Son (1 eps)
Son Young-soon
Bus passenger (1 eps)
Hong Eun-jeong
Job interviewee (1 eps)
Koo Ja-geon
Job interviewee (1 eps)
Choi Kyo-sik
Neighbourhood man (1 eps)
Kim Nam-yee
Yi-jin's paternal aunt (1 eps)
Jang Jun-hyeon
Yi-jin's acquaintance / Director of Han River C&T (1 eps)
Lee So-yoon
Kim Min-chae (young) (1 eps)
Kim Na-in
Mover (1 eps)
Lee Beom-chan
Referee (1 eps)
Guk Joong-woong
Referee (1 eps)
Kim Nak-kyun
Detective (1 eps)
Lee Jae-woo
Photo studio owner (1 eps)
Seok Hee
Sawaguchi (1 eps)
Kim Ji-ho
MBS TV network employee (1 eps)
Song Yo-sep
MBS TV network department head (1 eps)
Jeong Jong-hoon
KBY TV network department head (1 eps)
Lee Jong-goo
Diner (1 eps)
Go Dong-eop
Diner (1 eps)
Choi Hwa-young
Diner (1 eps)
Bae Yu-ri
Hotel receptionist (1 eps)
Bae Hyun-kyung
UBS Network Sports department staff (1 eps)
Lee Jun-hee
Ha Byung-jin (1 eps)
Park Eun-young
Neighbourhood woman (1 eps)
Yun Bu-jin
Neighbourhood woman (1 eps)
Goo Si-yeon
Jae-kyung's co-worker (1 eps)
Kwak Myung-hwa
Fencing association executive (1 eps)
Kim Seong-yong
Disciplinary committee member (1 eps)
Nam Dong-ha
Disciplinary committee member (1 eps)
Yoo Min-joo
Park Hye-jin (1 eps)
Kim Si-kook
University teaching assistant (1 eps)
Cha Yong-hwan
Hwang Ho-jin (1 eps)
Oh Il-young
Carpenter (1 eps)
Jeon Jun-woo
Restaurant host (1 eps)
Park Yu-mil
UBS Network staff (1 eps)
Shin Hee-cheol
Detective Kim (1 eps)
Jeong Hyeon-cheol
Detective (1 eps)
Do Ye-chan
Policeman (1 eps)
Park Chan-young
Upset diner (1 eps)
Bae Ki-beom
Upset diner (1 eps)
Baek Ji-hye
Kim Da-mi (1 eps)
Lee Sang-kyung
Yang Chan-mi (young) (1 eps)
Kim Mi-hye
Shin Jae-kyung (young) (1 eps)
Kim Jun-ho
Jun-ho (1 eps)
Byun Yun-jeong
Ji-woong's mother (1 eps)
Yang Eun-sol
Reporter (1 eps)
Kim Jang-hwan
Reporter (1 eps)
So Jun-seong
Reporter (1 eps)
Na Ho-won
Bus driver (1 eps)
Choe Min
Fencing coach (1 eps)
Cha Mi-kyeong
Victim's mother (1 eps)
Son Dong-soo
Sports agency employee (1 eps)
Choi Nam-wook
Fencing association employee (1 eps)
Kim Joo-ah
Sophia Choi (1 eps)
Park Yong
9/11 survivor (1 eps)
Lee Sung-il
UBS Network staff (1 eps)
Ha Seung-youn
Hospital hallway woman (1 eps)
Park Se-in
Han Min-jung (1 eps)
Kang Moon-kyung
UBS director 2009 (1 eps)
Park Bin
UBS Network staff (1 eps)
Park Bo-bae
UBS Network staff (1 eps)