Wei Ying Luo reveals to the empress what transpired at Consort Gao's Palace. She realizes that although the perpetrator was not Fuca Fuheng, he is still in some way involved in her sister's case, even so much as to stall her sleuthing in order to protect her. She discovers who the perpetrator is but has to make a difficult choice in the end. (Source: frankly at MyDramaList)