Kim Jong Kook naturally showed his concerns to "Running Man" co-star Song Ji Hyo after he noticed her weight loss.

Keep on reading for details.

Kim Jong Kook Invites Song Ji Hyo on His Live Broadcast

However, Kim Jong Kook was not happy with what she said and told her, "Okay, I get it. But, you should exercise. You know there is equipment that you can use while lying down. There are lots of them in the gym. Use them. You need more muscles."

Kim Jong-kook sounded as if he was truly worried about Song Ji-hyo, and the fans were happy to see their genuine friendship on and off the screen.

Furthermore, catch Kim Jong Kook and Song Ji Hyo on "Running Man" every Sunday on SBS.

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Shai Collins wrote this.