Super Junior consists of nine highly skilled assassins who are trained since young to protect Seoul Korea while undercover. Their leader, Park Jungsoo (Leeteuk), rules his group with an iron fist, pushing each and everyone of s to their limits during missions. They received a mission to arrest a group of terrorists and they figured out that it is a group of nine girls called Girls' Generation, their leader being Kim Taeyeon.

In reality, both Leeteuk and Taeyeon has met before on a blind date organized by their meddlesome mothers which wishes to marry their respective child off. Gradually, their relationship becomes something more than 'just friends'. But when the time comes, will Leeteuk make the right choice? Taeyeon or Seoul Korea? Unknown to Leeteuk, Taeyeon has something to hide as well...