Cast 65
Ahn Hyo-seopNam Si-heon / Koo Yeon-jun
Jeon Yeo-binKwon Min-ju / Han Jun-hee
Kang HoonJung In-gyu
Jang Hye-jinBae Mi-yeong
Park Hyuk-kwonBae Chi-won
Yun Sang-jeongSung Hye-mi
Han Ji-wonLee Su-jinSSong Ji-wooByeon Da-hyeonKKim Yi-kyeongPark Ji-hui
Baek Seong-cheolSe-kwon
Kim Cheol-yunBum-sun
Lee Joo-silGye-sun
Jang Yoon-jeongJi Yong-seon
Oh YongDong-jun
Seo Ye-hwaSeo Na-eun
Lee Min-gooKwon Do-hun
Min Jin-woongOh Chan-yeong / Oh Chan-hui
Hwang Soo-minAnchor (Eps 1)
Kim Si-kookSilver Lining employee
Kim Hee-changByung-ryul
Kim Geon-hoNoksan High School chemistry teacher
Lee Rang-seoSeul-ki
Jang Se-hyunSang-ho
Lee Ji-haSoo-kyung
Lee Na-raKoo In-yeong (Eps 1, 7, 8)
Ahn Jong-jinSilver Lining employee
Sung Ki-yoonKwon Sang-jo
Im Tae-poongJung In-gyu (young)
Kim Ji-wooNam Si-heon (young)
Kwon Hyuk-sooDoctorLLee Jung-yeolBus driver
Park Ki-woongDoctor Choi Myung-il
Jung Soo-hanSeung-ho
Hong Seok-binNoksan High School vice-principal
Kim Deok-juJun-hee's grandmother
Ahn Chae-heumJun-hee's friend
Jung Seo-yeonHan Jun-hee (young)KKang Myeong-juMi-sunJJeong Hyeon-wooDoctor
Lee Dong-kyuAnchor
Kim Won-sukPrison guard
Kim Byeo-riHotel receptionist
RowoonTae-ha
Do Sang-wooPark Do-hyeon
Kwon Ha-youngWaitress
Park Seoung-taeElderly pedestrian
Nam Jeong-wooRestaurant manager
Jung Han-bitDo-hyeon's girlfriend
Choi Se-inCrying restaurant girl
Kim Tae-jeongPark Min-sang
Lee Joo-youngBlind date student
Jung Ji-hyeonBlind date student
Noh Hyun-seokBlind date student
Yoon Jin-seongChan-yeong's motherKKim Seo-junOh Chan-yeong (young)
Oh Min-jeongChan-hui's caregiver
Hwang Jae-yeolDetective Ki-won
Jeong Doo-wonDetective Yoon-ho
Kim Jae-manPhoto studio owner
Kim Joo-hwangElectronics repairman
Oh Kyung-jooChang-joo
Park Hui-jeongYoon-mi
Do Ye-joonSeo Hyeon-uk
Kim Kyung-minKang Jung-woo
Lee Si-onCrying boy