Kim Jong Kook's cuteness went through the roof when he tried out the popular 'apple hair' style. On April 10th's episode of SBS's "Running Man", the muscular singer was subjected to a stress test with the goal of getting the least stress possible. Other team members tried to get Kim Jong Kook's stress levels up by tying his hair up. He successfully pulled off the 'apple hair' by making cute expressions, to the surprise of his team members. Yoo Jae Suk moved onto attacking him with food, and the singer had no choice but to eat what he was given. He is normally very health-conscious, so he is known to eat only healthy foods. The members also gave him a uni-brow and tried to make him angry, to the delight of the cast and staff. Source: TV Daily via Nate