On the December 13 broadcast of MBC's 'Infinite Challenge', MC Yoo Jae Suk revealed to the viewing audience that after reflecting on Noh Hong Chul's drunk driving incident, the show had set up an experiment for the five cast members.

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Yoo Jae Suk explained, "On the dawn of November 8th, 2014, while the world was sleeping, a phone rang for a group of people. 'Infinite Challenge's member Noh Hong Chul's drunk driving incident. We let out a regretful sigh at this unbelievable news. And so, we are now five members."

He continued, "However there are people talking. The viewers are concerned about the current, five remaining members. The production crew and I have made a big decision. The night before recording, we will call over the members for a drinking party; whether they come or not, we will see."

Yoo Jae Suk enlisted the help of former pro baseball player Seo Jang Hoon to spy on his fellow cast members. For three weeks, Seo Jang Hoon invited the cast members out to a drinking party; each time, he would make sure to invite them on the night before filming for 'Infinite Challenge'.

While HaHa was able to decline drinking for two weeks, Jung Jun Ha eventually agreed to drink after being persistently badgered, and Jung Hyung Don readily accepted a drink without any hesitation, much to Yoo Jae Suk and the viewers' amusement. In the end, they were all caught for drinking at some point, with HaHa particularly enraged that he had held out for so long, only to be caught when Jung Hyung Don persuaded him to take a shot. 

Jung Hyung Don's early failure: