
probably since it's ancient time, people don't have a lot of iq (rip education) and since it's the palace, people are suspicious of each other. beside, the fifth prince never has good relationship with lord beining (mc). as a mother, i think it's normal to be hysterical and paranoid especially when she just found the corpse. it's impossible to work together with the others to kill her own son. for a concubine their own son is their lifebreath, usually even more important than their own life. actually i feel a bit sorry for her bc the fifth prince is a complete victim in this (although he is a big jerk)
the whole time that concubine jia was being weirdo i was like literal just sideye, not even angry at her, just sideye. can't rlly understand people who get so angry at others without even knowing if the persin they're angry to was the one who really made them angry