戻ってきたの

came back

→ 戻る
phrase Uncommon #9,563
came back At the end of a sentence, の can make a question sound conversational or seek an explanation. The phrase itself is in a casual form.
JA: もう戻ってきたの?
EN: Did you come back already?

もう戻ってきたの?

You're back already?

トムは、ボストンに戻ってきたの?

Has Tom come back to Boston?

トムはいつ戻ってきたの?

When did Tom get back?

杏奈に手紙を書いたんだけど、戻ってきたのよね。

I wrote Anna a letter, but it came back to me.

何故戻ってきたの?

Why did you come back?

— ラスト、コーション (2007)

戻ってきたの?

Are you back?

— イップ・マン 序章 (2008)

いつ戻ってきたの?

When did you get back?

何しに戻ってきたの?

What did you come back for?

— 罪人たち (2025)

だから戻ってきたの?

So that's why you came back?