The original photo below shows IU and Lee Hyun Woo smiling brightly against a swingset on a sunlit backdrop. It looks perfectly summery, and both of them look incredibly comfortable in the sun.
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However, a behind-the-scenes photo shows that the photo was taken in the middle of winter. The pair are shivering in the wind in their shorts and t-shirt and can be seen trying to fight off the cold.
How incredibly professional of both of them!