Heechul, Hongki, Simon D, and their AB brothers

On August 2nd, Heechul of Super Junior uploaded a photo on his Twitter account that showed him with his 'brothers' who have AB as their blood type. As you can see from the photo above, his AB brothers include F.T Island's Lee Hongki, Supreme Team's Simon D, and Mighty Mouth's Sangchu and Jo Sung Mo. The boys are all a member of an AB blood type celebrity meeting group called Jjo Ko Bol (???), which in Korean is the initial of, "People who are a little bit psycho, yet attractive the more you know them." Other celebrities who are a part of this group include Epik High's Mithra, SHINee's Jonghyun, and Natsun. Hongki and Simon D also showed love to their AB brothers as they each shared the photo through their respective Twitter accounts as well.