YoonA and Lee Bum Soo made fans forget the two's 20-year with their chemistry in still cuts for 'Prime Minister and I'!

Once reporter Nam Da Jung (YoonA) and prime minister Kwon Yool (Lee Bum Soo) laid eyes on each other, there was no turning back as the stills cuts show Lee Bum Soo hilariously helping YoonA to hide from the prime minister's office employees. YoonA ends up becoming flustered by Lee Bum Soo's unintentional skinship.

Regarding the filming going on, a rep commented, "YoonA is the endorphin of 'Prime Minister and I'. She always films with a bright smile which rejuvenates the tired staff... Lee Bum Soo, YoonA, Yoon Si Yoon, Chae Jung An, Ryu Jin, and everyone are filming in a friendly atmosphere. Please look forward to 'Prime Minister and I' which premieres on December 9."

While we wait for the premiere, brighten up your day with YoonA's contagious smile in the BTS photos below!