Loan contract dispute between Shandong Re-Guarantee Group Co., Ltd,Qingdao-based Jiaozhou Sanhe Construction Investment Co., Ltd,Qingdao-based Kerun Real Estate Co., Ltd, Shandong-based Chunjiu Environmental Engineering Co., Ltd, Wang Shunqiang, Qingdao-based Sanshui Real Estate Co., Ltd and Kerun Holdings Investment Co., Ltd