In which episode, Cui Jinxi asked why women in Zhen Xuan Palace like sweets?

The imperial concubine met the king of Guo County and took Meng Jingxian into the palace. At this time, Ning Ai was "hiding" to watch the "play". When Xi Guifei returned to Yongshou Palace, Ning Ai had arrived. Ning Jian said that when the infatuation day of Xian Fujin fell, in the eyes of Xian Fujin, Xian Fujin's housework was inevitably ruined. After Ning Ai left, Jin xixi asked Xi Guifei if she knew why concubines in the palace loved sweets. Xi Guifei said that she may have a bitter heart and can only eat sweets to make up for it.