There actually quite a lot of smart actors in the business! This isn't too much of a surprise because some actors really use their brains to analyze and portray their characters well in any given situation, but still did you realize that they were this genius?
Yoon So Hee
This SM actress is in the top science and engineering university of South Korea, KAIST, for chemical and bio-molecular engineering.
Nam Ji Hyun
The young actress is studying psychology at the high-ranking Sogang University.
Lee Byung Hun
Revealed his IQ to be 155.
Kim Tae Hee
Has an IQ of 148. She scored 100% in all subjects throughout middle school, ranking her in first place by a long shot. She was accepted into the top university of South Korea, Seoul University.
Ha Yeon Joo
Known to have an IQ of 156 and is a member of the Mensa Society.
Kim Jung Hoon
His IQ was 146 while he was in elementary school. While he promoted as singing group UN, he studied dentistry at the prestigious Seoul University.
Kim Rae Won
He not only plays a smart doctor but also has a pretty high IQ in real life. He has an IQ in the high 140's.
Park Ye Jin
Mentioned in 'Family Outing' that her IQ is 147.
The son of well-respected educators, he has an IQ of 147.
Kim Hye Soo
The actress, with an IQ of 140, graduated from the prestigious Sungkyunkwan University.
Jang Dong Gun
Known to have an IQ of 143.
Song Joong Ki
Had the highest grade of 'Outstanding' in every single subject in his senior year of high school. Always ranked in the top ten, scored a 380 out of 400 in his college entrance exam, and was accepted into Sungkyunkwan University.