YoonA, Lee Bum Soo, Yoon Si Yoon, and Ryu Jin from KBS 2TV's upcoming drama 'Prime Minister and I' featured as guests on the December 5th episode of 'Happy Together 3'.

As one of the most loved idols, the Girls' Generation member was asked to go through an 'Ideal Type World Cup' in which she had to ultimately choose her ideal type out of the given choices: Yoo Jae Suk, Park Myung Soo, Ryu Jin, Lee Bum Soo, Yoon Si Yoon, Huh Kyung Hwan, Jung Bub Gyoon, and Producer Sub.  

She narrowed the choices down to Yoo Jae Suk, Lee Bum Soo, Yoon Si Yoon, and Producer Sub. When Producer Sub was chosen over Yoon Si Yoon, he expressed his sincere joy. YoonA explained, "I really like his reactions."

However, in the end, she chose Lee Bum Soo over Producer Sub, picking him as her ideal type in the limited 'Ideal Type World Cup'.

You can check out the YoonA and Lee Bum Soo's chemistry once their drama starts airing on December 9!