Lack of interest with 知ったことか
The expression 知ったことか implies a lack of interest in a thing.
“I have nothing to do with it.”
Examples
三ツ星カラーズ » Volume 1 » Page 138
それでも歩は寄せてくる » Volume 2 » Page 97
The expression 知ったことか implies a lack of interest in a thing.
“I have nothing to do with it.”