On July 29 episode of 'Boat Horn Clenched Fist', BTOB's Sungjae and Yook Joong Wan battled it out through an arm wrestling match.
Yook Joong Wan said to Sungjae, "I saw your SNS recently, you've been working out lately. Wow, it's no joke." Then he suggested to Sungjae that they play a game and the winner gets a wish from the loser. Both agreed to an arm wrestling match in which Sungjae was confident in the beginning.
As soon as the first match started, Sungjae lost very quickly in which caused him to burst out in laughter. The second match was no different and Sungjae lost right away once again. Yook Joong Wan joked, "Why're you even working out?" Afterward, they had a third match of rock-paper-scissors in which Sungjae lost one more time. He dropped to the floor in despair while Yook Joong Wan celebrated in front of him.