Kim Hyun Joong has been endorsing one of Korea's biggest credit card companies, Samsung Card for quite some time now. The campaign with Kim Hyun Joong created the "Why Not?" Samsung Card slogan and that continues in the newest CF (Commercial Film) for Samsung Card. The CF shows Kim Hyun Joong on a bike on the Namhae Bridge with words stating that he never received a letter like this before. The letter is actually a Television bill for 3.6 million won (around $3217 US), however he wasn't sad to receive this bill as his Samsung Super S Card reward points paid for it all.