Luan Jiansheng. Luan Jiansheng is the general manager of the Consumer Finance Center of the Credit Card Department of Huizhou Industrial and Commercial Bank. Since 2009, the credit card business of ICBC has greatly improved its contribution and position in the internal business of ICBC. It has led ICBC's credit card business to the position of "the world's largest card-issuing bank" and is the leader of ICBC and even China's credit card business.