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が、実は

but actually

→ が
phrase Rare #39,533
but actually Used to introduce a surprising fact that contrasts with what was just stated or what seems to be true.
JA: 彼は元気そうだったが、実は熱があった。
EN: He looked well, but actually he had a fever.

その男の子は病気には見えないが、実は病気だ。

That boy doesn't look sick, but he actually is.

夫の方が殴ったと彼女は言っているが、実はその逆だった。

She says her husband hit her, but in fact, it was the other way around.

彼は教師をしているが、実はスパイだ。

He is a teacher, but in reality, he is a spy.

彼は落ち着いて見えたが、実はとても緊張していた。

He looked calm, but he was actually very nervous.