"After Di Renjie (played by Zhao Youting) solved the Dragon King case in Shendu, Emperor Gaozong (played by Sheng Jian) gave him the divine weapon Kang Long Mace, which made the queen Wu Zetian (played by Carina Lau) jealous. In order to steal the Kang Long Mace and frame Di Renjie, the queen convened a group of "strangers" who knew alchemy. "Group" is plotting something evil and orders Yuchi Zhenjin (played by Feng Shaofeng) to lead the team..."