When Murong Qiqi took the Water Moon Mirror earlier, Longze Jingtian recognized her identity - Du Xian'er.
The woman he had been looking for was right in front of him, and he had even fallen in love with her ordinary side, which made Longze Jingtian marvel at the greatness of fate in the world. It turned out that Murong Qiqi really was Du Xian'er; she had played with him and manipulated him like a toy, and he had almost missed her!
Just now, Longze Jingtian had been carefully recalling if he had ever offended Murong Qiqi and finally remembered that on their first meeting, when she saved him, he had later said that he would definitely break off the engagement and divorce the useless girl from the Prime Minister's Mansion. She must have heard this, held a grudge, and retaliated against him!