の話も

what someone says, too; someone’s account or argument as well

→ の
phrase Rare #45,862
what someone says, too; someone’s account or argument as well 話 refers to the person’s claims or side of a discussion, and も adds “too” or “as well.”
JA: 反対側の話も聞いたことがある。
EN: I’ve heard the other side’s account too.

あの男の話もウソだ

That man’s story is a lie too.

— 羅生門 (1950)

反対側の話も聞いたことがある。

I've heard the other side of the story, too.