Series Cast 18

1. 

   Kwak Dong-yeon

   Choi Jung Woo (4 Episodes)

2. 

   Lee Se-young

   Yang Ah Young (4 Episodes)

3. 

   Kwak Jung-wook

   Im Duk Won (4 Episodes)

4. 

   Choi Tae-joon

   Lee Yuk Ho (4 Episodes)

5. 

   Park Jeong-min

   Shin Young Bok (4 Episodes)

6. 

   Bae Noo-ri

   Jang Hyun Jin (4 Episodes)

7. 

   Yoon Park

   Lee Won Il (4 Episodes)

8. 

   Baek Sung-hyun

   adult Choi Jung Woo (4 Episodes)

9. 

   Jeong In-gi

   Jung Woo's father (4 Episodes)

10. 

    Koh Soo-hee

    Jung Woo's mother (4 Episodes)

11. 

    Oh Youn-hong

    Ah Young's mother (4 Episodes)

12. 

    Jeong Soo-young

    Homeroom Teacher (4 Episodes)

13. 

    Yun Ju-Sang

    Yuk Ho's grandpa (4 Episodes)

14. 

    Ahn Ji-hyun

    Moon Soo Jung (4 Episodes)

15. Kim Dong-hee

    Park Sung Tae (4 Episodes)

16. 

    Lee Jong-hyun

    Yang Young Woong (2 Episodes)

17. 

    Lee Sung-yeol

    student council president (1 Episode)

18. 

    Kim Hwan-hee

    Young Bok's little sister (1 Episode)

Series Crew 3