According to the reps of 'Infinity Challenge', Park Myung Soo was suffering from enteritis (intestinal inflammation) while filming the show on the 25th and was rushed to the emergency room where he was also found to have a case of shingles. 

Park Myung Soo's reps stated, "Park Myung Soo's health hasn't been good lately. But he was able to recover and participated in the filming of 'Infinity Challenge' on August 1."

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We wish Park Myung Soo a speedy recovery!