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The brother and sister pair left fans wanting to pinch their cheeks as they posed in their adorable outerwear and tracksuits for 'Lemon Tree'. Sung Joon showed himself to be a dependable older brother as he leads his sister, holding her hand.

A rep commented, "Contrary to their normally chic image, the brother-and-sister were warm and affectionate with each other throughout, making the atmosphere on set sweet... Joon and Bin modeled the warmth and comfort of the sports outerwear so we were satisfied with the results."

Aren't they adorable? Make sure you're keeping up with the siblings as they continue on their New Zealand adventure with their father!