F.T. Island's Hongki defined his relationship with actress Park Shin Hye during his radio show. 

On the October 17 installment of 'Kiss the Radio,' Park Shin Hye graced Hongki's debut episode as a special guest. The two are known to be best friends. 

Hongki introduced Park Shin Hye by saying, "She is a South Korean actress, but to me, she is a girl who is a friend. Nothing more, nothing less."

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With that introduction, Park Shin Hye appeared in a casual outfit, and the two showed off their close friendship by whispering to each other.