for people a bit confused, the letter was between the dead father (shuli’s husband) and the brother of the biological mother (red head, first wife). shuli’s plan is to use the letter as evidence for divorcing or making her marriage with the father invalid, thus making Jeremey the heir or head of the family, which will then save his hand from being chopped by the dumb queen
besides the letter, she needs a witness, but the brother of the biological mother refused to see shuli soooo shuli came to aunt (sister of the passed father) for help in the matter.
side note: why would the brother of the biological mother not want to see shuli? everyone knows jeremy is in trouble, even the aunt knew the reason why shuli was visiting was because of jeremy.... like brooo jeremy is ur newphew i get it might be awks but hell ur nephew who is the son of your dead sister,,, there probs a deeper story but poor jeremy
((