Jun Jiuge grew up in the deep palace, with a simple mind. She had never seen a man outside of eunuchs, so she fell for the handsome and unrestrained Shangguan Yunsu at first sight and vowed to marry no one but him.
Regrettably, Shangguan Yunsu never had his heart set on Jun Jiuge from the beginning. He exploited Jun Jiuge's trust to become a trusted minister of the emperor, in charge of the military and provisions. When Qingjun led the troops in attack, he collaborated with Qingjun from inside and outside, and successfully took over the city and the pools, causing the downfall of the Xia Dynasty within just two days.
Therefore, Shangguan Yunsu never loved Jun Jiuge from the start. To him, Jun Jiuge was merely a pawn, so, his current state was indeed somewhat improper. Zhou Beicheng quickly realized this and swiftly entered the role.