Which episode is the formula of freesia for catching dew?

Season 1 episode 4. "The Story of Cang Lan" tells the story of sadism between the arrogant devil, Oriental Qingcang, and the gentle and lovely fairy Xiaolan. In the fourth episode of the first season of the play, Dongfang Qingcang personally went to Zhongshuige to fetch dew for Xiaolan, the heroine, and then brought it to Xiaolan.