Cha Yoo-jin (16 episodes, 2014)
Seol Nae-il (16 episodes, 2014)
Franz von Stresemann (16 episodes, 2014)
Yoo Il-rak (16 episodes, 2014)
Jung Shi-won (16 episodes, 2014)
Choi Min-hee (16 episodes, 2014)
Ma Soo-min (16 episodes, 2014)
Lee Yoon-hoo / Lee Yoon-Hoo (16 episodes, 2014)
Goo Seon-jae (16 episodes, 2014)
Lee Jae-yong (16 episodes, 2014)
Do Gang-jae (16 episodes, 2014)
Song Mi-na (15 episodes, 2014)
Yang Sun-young (15 episodes, 2014)
Yoo Won-sang (13 episodes, 2014)
Cha Yoo-jin (youngster) / Cha Yoo-jin (youngter) (14 episodes, 2014)
Ahn Geon-seong (13 episodes, 2014)
Jang Woo-seong (10 episodes, 2014)
Lee Dan-ya (9 episodes, 2014)
Chairwoman (9 episodes, 2014)
Chae Do-gyeong (8 episodes, 2014)
Sebastiano Viera (8 episodes, 2014)
Han Seung-oh (7 episodes, 2014)
Im Jae-jung (7 episodes, 2014)
Cha Dong-woo / Cha Dong Woo (5 episodes, 2014)
(4 episodes, 2014)
Nae-Il's Ex-teacher / Nae-il's Ex-teacher (4 episodes, 2014)
Son Soo-ji (3 episodes, 2014)
Professor (3 episodes, 2014)
Nae-il (youngster) (3 episodes, 2014)
Yoo-jin's Uncle (2 episodes, 2014)
Nae-il's Mother (2 episodes, 2014)
Min-hee's Dad (1 episode, 2014)
Nae-il's Father (1 episode, 2014)
(1 episode, 2014)
young Min Hee (1 episode, 2014)