는 나의

is my; as for [subject], my

→ 는
phrase Rare #26,071
is my; as for [subject], my 는 is a topic marker attached to the preceding noun, while 나의 means “my” or “mine.” 나의 is more formal or literary than 내. This sequence is compositional rather than a fixed idiom.
KO: 승리는 나의 것이에요.
EN: Victory is mine.

승리는 나의

Victory is mine.

— 당갈 (2016)

카노바는 나의 어머니와 거의 결혼할 했어

Canova almost married my mother.

— 러시아 방주 (2002)