Full cast of Dr. Brain

Lee Sun-kyun

Koh Se-won

6 episodes

Park Hee-soon

Lee Kang-mu

6 episodes

Seo Ji-hye

Lieutenant Cho

6 episodes

Lee You-young

Jung Jae-yi

6 episodes

Lee Jae-won

Hong Nam-il

6 episodes

Teo Yoo

Secretary Yoon

6 episodes

Cha Hee

Dr. Hahn

6 episodes

Um Tae-goo

Lee Tae-goo

3 episodes

Jo Bok-rae

Sergeant Park

1 episode

Moon Sung-keun

Dr. Myung

1 episode

Ahn Mi-na

Yoo-jin

1 episode

Jeon So-nee

Reporter

1 episode

Kim Ju-hun

Jun-ki

1 episode

Park Ji-ye

Mi Na

1 episode

Kong Seong-ha

Lim Jun-Ki's Wife

1 episode