

Kim Jung-hyun
Kim Bo-gyeom
16
70 minutes
KBS2
South Korea
Korean
Source: Wikipedia
Baek Soo-young, Noh Go-jin's ex-girlfriend
Chief Ma
Lee Yong-gu, Lee Shin-ah's father.
Oh Se-gi, handsome vice president of GOTOP Education who is the only person that can comfort Go-jin.
Joo Jun-pal, a solver of the Heungshinso who is called detective Zhull.
Oh Se-hee, Oh Se-gi sister
Lee Shin-ah, Go-jin's secretary.
Lee Su-ho, Lee Shin-ah's brother and Chu Ok-hee's boyfriend.
A reporter
Noh Go-jin, math instructor and CEO of GOTOP Education who pretends to have amnesia after being involved in a car accident.
Park Tae-yang, representative of Mirae Edu.
Hong Yeo-sa
A cleaning employee
Kang Min, a former English teacher who was kicked out by Noh Go-jin.
Choo Ok-hee, Lee Shin-ah's close friend who lives with her. Ok-hee has a career as a stage actor. She is a true friend that Shin-ah can rely on. During the day, she works part-time as a secretary at a lawyer's office and goes to auditions all the time.