Source: The Straits TimesThe creator of South Korean hit Running Man says soccer star Park Ji Sung is his favourite guest on the comedy-variety show so far."He is known for his poker-faced image," recalls production director Cho Hyo Jin, 38, of the Seoul-born former Manchester United midfielder, 31."But when he came on, it was a drastic change. He showed himself to be very cheerful and fun-loving."Cho was here earlier this week for the Asia TV Forum & Market. Described as "urban action variety", the show pits a regular cast against one another or against a team of celebrity guests in challenges. Contestants have had to find golden pigs filled with money and collect as many Running Man balls as they can.Broadcast on the Seoul Broadcasting System (SBS) network every Sunday in South Korea, the show is consistently watched by at least 14 per cent of viewers in the country. Since its debut in 2010, it has also aired in places such as Taiwan, Japan and Brunei.The programme has received a lot of exposure, with K-pop stars from Super Junior, Girls' Generation and other bands showing their playful side on it, keeping legions of their fans tuned in.