Nan Ruo's stubbornness

#1

Why is Nan Ruo so stubborn and not daring to admit she’s Nan Kui? What promise did she really make to the dead Nan Ruo? I’m so curious.

#2

How long will it take Nan Ruo to let go of the past? How cruel will she be to her own son just to fulfill her promise to the dead, how can a person be so heartless like her? It’s really unfair.