Series Cast 20

1. 

   Lee Min-woo

   Lee Min-jae (67 Episodes)

2. 

   Kim Jeong-hyeon

   Kim Jeong-tae (67 Episodes)

3. 

   Lee Eun-ju

   Goo Ji-won (67 Episodes)

4. 

   Kim Joo-hyuk

   Jung Myung-hwan (67 Episodes)

5. 

   Lee Na-young

   Lee Hye-sung (67 Episodes)

6. 

   Kang Sung-yeon

   Min Kyung-jin (67 Episodes)

7. 

   Lee Hwi-hyang

   Lee Hee-jung (67 Episodes)

8. 

   Ji Sung

   Kang Dae-Wook (67 Episodes)

9. 

   Kim Mi-kyeong

   Cafeteria lady Kim Mi-Soon (67 Episodes)

10. 

    Kim Min-jung

    — (14 Episodes)

11. 

    Hong Soo-hyun

    — (14 Episodes)

12. 

    Youn Yuh-jung

    Professor (14 Episodes)

13. 

    Jo Hyun-jae

    — (14 Episodes)

14. 

    Lee Jae-hwang

    — (14 Episodes)

15. 

    Kim Jae-in

    — (14 Episodes)

16. 

    Kim Seung-su

    — (14 Episodes)

17. 

    Kim Chang-wan

    — (14 Episodes)

18. 

    Baek Il-seob

    — (14 Episodes)

19. 

    Ki Tae-young

    — (14 Episodes)

20. 

    Kim Yeo-jin

    Professor Eun Na-young (14 Episodes)

Series Crew 2