as Nam Si-heon / Koo Yeon-jun
12 episodes
as Kwon Min-ju / Han Jun-hee
12 episodes
as Jung In-gyu
12 episodes
as Bae Mi-yeong
12 episodes
as Bae Chi-won
12 episodes
as Sung Hye-mi
12 episodes
as Lee Su-jin
12 episodes
as Byeon Da-hyeon
12 episodes
as Park Ji-hui
12 episodes
as Se-kwon
12 episodes
as Bum-sun
12 episodes
as Gye-sun
12 episodes
as Ji Yong-seon
12 episodes
as Dong-jun
12 episodes
as Seo Na-eun
12 episodes
as Kwon Do-hun
12 episodes
as Oh Chan-yeong / Oh Chan-hui
12 episodes
as Anchor
1 episode
as Silver Lining employee
1 episode
as Byung-ryul
1 episode
as Noksan High School chemistry teacher
1 episode
as Seul-ki
2 episodes
as Sang-ho
3 episodes
as Soo-kyung
3 episodes
as Koo In-yeong
3 episodes
as Silver Lining employee
1 episode
as Kwon Sang-jo
1 episode
as Jung In-gyu (young)
1 episode
as Nam Si-heon (young)
1 episode
as Doctor
1 episode
as Bus driver
1 episode
as Doctor Choi Myung-il
1 episode
as Seung-ho
1 episode
as Noksan High School vice-principal
1 episode
as Jun-hee's grandmother
1 episode
as Jun-hee's friend
1 episode
as Han Jun-hee (young)
2 episodes
as Mi-sun
2 episodes
as Doctor
1 episode
as Anchor
1 episode
as Prison guard
1 episode
as Hotel receptionist
1 episode
as Tae-ha
1 episode
as Park Do-hyeon
1 episode
as Waitress
1 episode
as Elderly pedestrian
1 episode
as Restaurant manager
1 episode
as Do-hyeon's girlfriend
1 episode
as Crying restaurant girl
1 episode
as Park Min-sang
2 episodes
as Blind date student
2 episodes
as Blind date student
2 episodes
as Blind date student
1 episode
as Chan-yeong's mother
1 episode
as Oh Chan-yeong (young)
1 episode
as Chan-hui's caregiver
1 episode
as Detective Ki-won
1 episode
as Detective Yoon-ho
2 episodes
as Photo studio owner
1 episode
as Electronics repairman
2 episodes
as Chang-joo
1 episode
as Yoon-mi
1 episode
as Seo Hyeon-uk
1 episode
as Kang Jung-woo
1 episode
as Crying boy
1 episode