"Since the possibility of the document being signed before finalization absolutely doesn't exist, the document was signed after finalization."
Yun Chu was still talking to herself.
If she were at her own home, she would be recording while speaking, because her logical deductions often follow wherever her thoughts lead. She worries she might forget, as her memory isn't very good, so she'd usually have a recorder in hand while she talks. If she remembers later, it's fine; if she can't recall certain details, she'd listen to her recording again.
Presently, since Tan Jincheng is beside her and she isn't at her own home, and not having a recorder at hand, she can only rely on her memory.
Fortunately, her thoughts are very clear now, and as of now, the branches involved in the logical deduction aren't too many, mostly stemming from the main point.
