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が、本当は

but actually

→ が
phrase Rare #40,865
but actually Introduces a contrast between how something seems and what is actually true.
JA: 彼は怒っているように見えるが、本当は悲しいのです。
EN: He looks angry, but actually he is sad.

眠っているようだったが、本当は死んでいた。

He appeared to be sleeping, but in fact he was dead.

あの人は私にとても厳しいようですが、本当はたいへん親切な人なのです。

That person may seem very strict with me, but they’re actually very kind.

人々は君に批評を求めるが、本当は誉めてもらいたいだけなのだ。

People ask you for criticism, but what they really want is praise.