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?

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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.

Ji Sung

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