SEE ALSO: YoonA looks dazzling in a little black dress for 'Prime Minister and I'

YoonA and Lee Bum Soo filmed their fish date at Hwaseong, Gyeonggido, and the Girls' Generation member especially surprised the others with her fear of fish. Upon holding the fish, the idol-turned-actress squinched her face and couldn't concentrate. She was able to overcome her phobia by acting as the fearless reporter Nam Da Jung.

A rep commented, "Thanks to YoonA, who showed an unexpected image, the set was full of laughter... YoonA said that she is scared of the fish because of their slipperiness. But she was able to overcome her fear and act out the scene, receiving applause... Lee Bum Soo, who noticed YoonA's menboong status, showed his caring side by giving her time to regain mind control."

How are you liking 'Prime Minister and I' so far?