New arrival to the rear palace (based on Consort Xu Hui of Tang)
Xu Minhui arrives at the palace bearing an uncanny resemblance to someone from the past. She is the younger sister of Xu Hui, and her beauty makes her a valuable pawn in the empress's schemes. Despite being placed as a spy, her ISFJ nature makes her genuinely conflicted about betraying anyone who shows her kindness.
Treating Xu Minhui with warmth in Chapter 23 can turn her from a spy into a genuine ally. Her ISFJ personality responds to emotional authenticity. If you treat her as an enemy, she becomes one; if you treat her as a friend, she may betray her handler for you.