我不知道
“Nope.”
THE DIALOGUE REEL
“You didn't know about this before?”
我不知道
“Nope.”
“Well, if I had known this back then, I definitely would have...”
Direct spoken expression in this communicative setting.
Claiming complete lack of prior knowledge ('不知者不罪') is commonly invoked to absolve oneself of moral responsibility or complicity.
LEARNING CHUNKS & PARTICLES
I don't know / I didn't know
A fundamental high-frequency phrase used to state unawareness; depending on context, it refers to present knowledge or past ignorance.