D.O. and Kim So Hyun shared insights to the behind the scenes of the movie 'Pure Love' during their recent appearance on 'Cultwo Show'.

On the radio show, Kim So Hyun was asked about the time D.O. had to give her piggyback rides in the movie. 

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She said, "I've never been given this many piggyback rides in my life. At first I kept telling him I was sorry, but I got comfortable as time went on because oppa didn't show any tiredness."

To this statement, D.O. added, "She was light like a feather. It was my first time giving this many piggyback rides. In the beginning it was hard because I was out of shape. But throughout the shooting of the movie, I exercised so I didn't get tired at all later."

Meanwhile, the movie 'Pure Love' is about a radio DJ receiving a letter that was sent 23 years ago, and the stories of first love and friendship it delivers. The movie is slated to be released in theaters on February 24.