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On 'Master Key' the two idols played a fitness tic tac toe game in order to get the win for their team. The two started but was soon stopped right away as they did not abide by the rules the first time. They immediately started over after listening to the rules once again. While Changsung followed the rules correctly this time around, Sungjong either forgot once more or didn't understand it which caused him to interfere with Chansung's game.

However, as Sungjong tried to grab onto Chansung to slow him down, he was absolutely no match for the 2PM member and was taken down right away. Seeing this funny situation unfold in front of the cast of the show, comedian Lee Soo Geun said, "Sungjong played dirty but he also didn't understand the game. Did you guys see Chansung's face in the middle of the game?" which caused everyone to laugh once more.

Are you enjoying 'Master Key' so far?