ン

(marks an explanation or emphasis)

n → の
particle Rare #43,994
(marks an explanation or emphasis) A stylized katakana spelling of the colloquial particle ん, usually written in hiragana.
JA: 今日は行けないンだ。
EN: The thing is, I can’t go today.
Forms of の
のんン

ンだ

Yeah.

— となりのトトロ (1988)

ンつ

Ntsu

— 崖の上のポニョ (2008)

だけどうンだぜ普通気付くだろ

But you'd normally notice, wouldn't you?

— The Garden of Sinners: Paradox Spiral (2008)

Sounds similar to