Bai Zheng exposes Leng Bei as a Northern Qin spy, holding An Ning hostage. He escapes and is reported to be Mo Bei, the illegitimate son of the Qin Emperor. Zi Yuan and Han Ye rush to Junxian City, while Ming Xi is dispatched to Qingnan City to support An Ning. Zi Yuan is ambushed and both Han Ye and Ming Xi rush to her aid, leaving An Ning to fend off Mo Bei by herself. (Source: frankly at MyDramaList)