On June 12, a teaser image for an upcoming disaster film 'EXIT' was posted online.
In the image, the two stars are dressed in a suit and hilariously make the letters 'E', 'X', 'I', and 'T' with their body.
What makes it even more funny is the way they are trying to keep a straight face.
The poster showed Yoona and Cho Jung Seok holding on to a rope connected between the letters 'X' and 'I' above lots of high buildings.
On the poster, it says, "When our lives were already stressful and tough enough, a natural disaster came to us!"
They used to be the members of the same college hiking club, but lost contact with each other after graduation.
The two characters unexpectedly run into one another at the 70th birthday party of Yong Nam's mother.
Then, all of a sudden, they are put in an emergency situation as toxic gas floods the city.
(Lee Narin, Credit= CJ Entertainment)
(SBS Star)