Comedian Jung Jun Ha confessed that he found it hard to keep up with his flagship program, 'Infinity Challenge'.

"Everything is hard on 'Infinity Challenge', but trying to deal with Park Myung Soo is the hardest," he said on the latest episode of 'Entertainment Relay' before quickly adding, "it's a joke".

"'Infinity Challenge' is a hard program to begin with," he continued. "The day before filming, I can't sleep. The hardest time is Wednesday night, before we film, and the happiest time is Thursday night, after I'm finished filming."