By Dramabeans
Lee Eung-bok, Kim Seong-yoon
Park Hye-ryun
16 (+1 special)
1
65–70 minutes
KBS2
South Korea
Korean
Source: Wikipedia
Maeng Seung-hee
(Ep. 1)
Song Sam-dong
Shi Kyung-jin
Go Hye-sung (Hye-mi's younger sister) Park Eun-bin as 16-year-old Hye-sung (Ep. 16)
(Ep. 13)
Hyun Moo-jin (Jin-guk's father)
Jung Ah-jung
President Jung Ha-myung (Ep. 1–4)
Jason's back up dancer (Ep. 3)
Lee Ri-ah
(IU) as Kim Pil-sook
(Ep. 9, 10)
Jin-guk / Hyun Shi-hyuk Kang Yi-seok as young Jin-guk (Ep. 2, 5 & 10)
Han So-ri (Ep. 6, 9, 12–13)
Jason's back up dancer (Ep. 3)
16-year-old Hye-sung (Ep. 16)
(Ep. 13)
Go Hye-mi Lee Joo-yeon as young Go Hye-mi (Ep. 2 & 5)
Ma Doo-shik
Ha So-hyun
Young Jin-guk (Ep. 2, 5 & 10)
Principal Shi Bum-soo
Kang Oh-hyuk
Song Nam-boon (Sam-dong's mother)
Jason
Yoon Baek-hee
Go Byung-jik (Hye-mi's father)