The crown prince is ill but seems to be holding steady. Minister Xun reads the history books detailing the same pandemic in Yeqin twenty-five years ago, noticing the young survived in contrast to the older people. He also surmises that Pu Yang Ying initiated the pandemic out of revenge. Yuan Qi traces the origin of the first cases near a well where two of Pu Yang Ying's men happen to pass by. Dr. Li tries a stronger prescription to save Lin Xi and though successful, it mysteriously does not have the same effect on the other patients. (Source: frankly at MyDramaList)