Producing team 'The Underdogs' stated to U.S. Billboard that they wanted to make an energetic pop song for Girls' Generation.

According to Billboard, who held an interview with The Underdogs, Damon Thomas stated that "Mr.Mr." featured an urban sound as they wanted the rhythm to fit with the choreography. 

Having that urban undertone would allow people to easily sing along and become addicted to this pop song.

The team also stated that they were fans of Girls' Generation and that they knew what type of songs the group has released before. 

They continued and talked about their time producing in Korea as well as Girls' Generation's huge popularity around the world.

Underdogs member Harvey Mason commented, "Girls' Generation is a group that appeals to the world. I could see just how many people truly loved their music when they received the YouTube Music Awards. They are amazing."

The Underdogs have also worked with Britney Spears, Justin Timberlake and other famous stars.