Girls' Generation's Sunny has earned the title of 'Best Brain Idol' on the latest filming of 'Invincible Youth 2'.

When the cast arrived for the filming, they were handed out exams containing questions on knowledge taught in elementary school (1st grade through 6th grade).

The members were unable to hide their shock as they found themselves unable to answer some of the questions on the test, despite it being an elementary school academic standards test.

However one member, Sunny, seemed unfazed as she easily solved through each problem - leaving everyone in awe at her calm approach and ability to solve through the problems.

When the exams were graded, many of the members' papers were filled with blanks and wrong answers. However, Sunny showed her ability to work through some of the more challenging mathematical calculations involving fractions, and as a result, achieved the best score out of all the members.

Catch the episode when it airs on March 3rd!

Source + Photo: MK News via Naver