Though Fang Fei’s intention was to force Shen Yu Rong and Princess Wan Ning to marry, Li Jin marries her instead which causes a rift between the Li family and the princess. Duke Su is unwilling to marry Situ Jiu Yue for Dazhao’s army support, so must convince her to reject her brother’s proposal. He discovers discrepancies in the weapons count of the Armory Office and takes matters into his own hands, much to the disapproval of the emperor. (Source: frankly at kisskh)