Of course Feng Jun was listening; actually, the rain today wasn't naturally formed but rather created using the Rain Prayer Array.
He was constantly sensing Hesheng with his Divine Sense from afar, and although its defense against brainwaves was strong, it ultimately wasn't professional—just a factory, not a densely populated urban area. As long as he was careful, there wouldn't be much trouble.
He observed everything and thus used the Rain Prayer Array because he was worried that once a deal was underway, there might suddenly be satellites above—the Human Race's satellites have been mostly shot down by the Insect Race, but recently quite a few have been launched.
The technology used by satellites here is undoubtedly much stronger than on Earth. Feng Jun couldn't guarantee whether they would have low-light and super remote sensing imaging capabilities, so it's best to cover it with rain clouds.
