のにな

if only

→ の
phrase Uncommon #10,540
if only Used at the end of a sentence to express regret or a wish that things were different.
JA: もっと早く知っていればよかったのにな。
EN: If only I had known sooner.

私にお金があったら買えたのにな。

If I had had the money, I could have bought it.

いつもそうしてくれたのにな

You always used to do that for me.

— 罪人たち (2025)

ジャングルにいたころにゃあのキムにだって分かってたはずなのにな

Even Kim must have known that back when we were in the jungle.

— イノセンス (2004)