Series Cast 12

1. 

   Jang Keun-suk

   Hwang Tae Kyung (26 episoder)

2. 

   Park Shin-hye

   Go Mi-nam / Go Mi-nyeo (26 episoder)

3. 

   Jung Yong-hwa

   Kang Shin Woo (26 episoder)

4. 

   Lee Hong-gi

   Jeremy (26 episoder)

5. 

   Uie

   Yoo He Yi (26 episoder)

6. 

   Kang Soo Han

   Hwang Tae Kyung (26 episoder)

7. 

   Kim Sung-ryung

   Mo Hwa Ran (26 episoder)

8. 

   Jung Chan

   President Ahn (26 episoder)

9. 

   Bae Geu-rin

   Sa Yu-ri (26 episoder)

10. 

    Kim In-kwon

    Ma Hoon-yi (26 episoder)

11. 

    Yoo So-young

    "Before School" girl group member (26 episoder)

12. 

    Lee Ju-yeon

    "Before School" girl group member (26 episoder)

Series Crew 4